8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934

Date of report (Date of earliest event reported): January 26, 2007

ALION SCIENCE AND TECHNOLOGY
CORPORATION

(Exact Name of Registrant as Specified in its Charter)

Delaware	333-89756	54-2061691
(State or Other	(Commission File	(IRS Employer
Jurisdiction	Number)	Identification No.)
of Incorporation)

10 West 35th Street	1750 Tysons Boulevard
Chicago, IL 60616	Suite 1300
(312) 567-4000	McLean, VA 22102
	(703) 918-4480

(Address, including Zip Code and Telephone Number, including
Area Code, of Principal Executive Offices)

     Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

[  ]	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
[  ]	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
[  ]	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
[  ]	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

1

Item 1.01     Entry into a Material Definitive Agreement

Purchase Agreement

On January 26, 2007, Alion Science and Technology Corporation (“Alion”, the “Company”) entered into a Purchase Agreement (the “Purchase Agreement”) with Credit Suisse Securities (USA) LLC (the “Initial Purchaser”), to sell to the Initial Purchaser $250.0 million aggregate principal amount of its 10 1/4% Senior Notes due February 15, 2015 (the “Notes”). Credit Suisse, an affiliate of the Initial Purchaser, also served as a lender under the Company’s Bridge Loan Agreement and serves as arranger, administrative agent and collateral agent under the Company’s Term B Senior Credit Facility.

A copy of the Purchase Agreement is attached to this current report on Form 8-K as Exhibit 10.82 and it is incorporated by reference as though it were fully set forth herein. The foregoing summary description of the Purchase Agreement and the transactions contemplated thereby is not intended to be complete, and it is qualified in its entirety by the complete text of the Purchase Agreement.

Amendment to Credit Agreement

On February 6, 2007, the Company entered into Amendment No. 4 (the “Amendment”) in connection with that certain Credit Agreement dated as of August 2, 2004 by and among the Company, Credit Suisse, acting through its Cayman Islands branch, individually and as Administrative Agent (formerly known as Credit Suisse First Boston, “CS”), the lenders signatory thereto and certain subsidiary guarantors of the Company, as amended (the “Credit Agreement”), pursuant to which certain terms of the Credit Agreement were amended including, among other things, an extension of the maturity date of the senior term loans outstanding under the Credit Agreement to February 6, 2013.

A copy of the Amendment is attached to this current report on Form 8-K as Exhibit 10.83 and it is incorporated by reference as though it were fully set forth herein. The foregoing summary description of the Amendment and the transactions contemplated thereby is not intended to be complete, and it is qualified in its entirety by the complete text of the Amendment and the Credit Agreement.

Issuance and Sale of Senior Notes

On February 8, 2007, the Company completed the issuance and sale of $250.0 million aggregate principal amount of the Notes. The Company issued the Notes pursuant to an indenture, dated as of February 8, 2007, among the Company, certain subsidiary guarantors of the Company and Wilmington Trust Company, as trustee (the “Indenture”). The Notes have not been registered under the Securities Act and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act of 1933, as amended (the “Securities Act”). The Company offered and sold the Notes to the Initial Purchaser in reliance on exemption from registration under the Securities Act. The Initial Purchaser has informed the Company that it intends to sell the Notes to qualified institutional buyers pursuant to exemptions from registration provided by Rule 144A and to others pursuant to Regulation S under the Securities Act. This current report on Form 8-K does not constitute an offer to sell, or a solicitation of an offer to buy, any security and shall not constitute an offer, solicitation or sale in any jurisdiction in which such offering would be unlawful.

The Company intends to use the net proceeds from the sale of the Notes to repay in full amounts outstanding under the Company’s Bridge Loan Agreement, and to repay approximately $72 million of the amounts outstanding under the Company’s Term B Senior Credit Facility.

A copy of the Indenture and the form of Notes is attached to this current report on Form 8-K as Exhibits 4.16 and 4.17 and they are incorporated by reference as though they were fully set forth herein. The foregoing summary descriptions of the Indenture and the Notes and the transactions contemplated thereby are not intended to be complete, and are qualified in their entirety by the complete text of the Indenture and the Notes.

2

Registration Rights Agreement

On February 8, 2007, the Company entered into a Registration Rights Agreement (“Registration Rights Agreement”) with the Initial Purchaser of the Notes, pursuant to which it agreed to use its reasonable best efforts to, among other things: (i) file with the Securities and Exchange Commission (“SEC”) a registration statement on an appropriate form under the Securities Act relating to a registered exchange offer (“Exchange Offer Registration Statement”) for the Notes under the Securities Act within 90 days after the issue date of the Notes and (ii) use reasonable best efforts to cause the Exchange Act Registration Statement to be declared effective under the Securities Act within 240 days after the issue date of the Notes.

A copy of the Registration Rights Agreement is attached to this current report on Form 8-K as Exhibit 10.84 and it is incorporated by reference as though it were fully set forth herein. The foregoing summary description of the Registration Rights Agreement and the transactions contemplated thereby is not intended to be complete, and it is qualified in its entirety by the complete text of the Registration Rights Agreement.

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The disclosure required by this item is included in Item 1.01 and is incorporated herein by reference.

Item 9.01	Financial Statements and Exhibits
(d)	Exhibits
4.16	Indenture dated as of February 8, 2007, among the Company, certain subsidiary guarantors of the Company and Wilmington Trust Company, as trustee.
4.17	Form of 10 1/4% Senior Notes due 2015 (included as Exhibit 1 to Exhibit 4.16 of this current report on Form 8-K).
10.82	Purchase Agreement dated as of January 26, 2007, by and between the Company and Credit Suisse Securities (USA) LLC.
10.83	Amendment No. 4 dated as of February 6, 2007, by and among the Company, Human Factors Applications, Inc. (“HFA”), Alion – METI Corporation (“METI”), Alion – CATI Corporation (“CATI”), Alion – JJMA Corporation (“JJMA”), Alion – BMH Corporation (“BMH”), Washington Consulting, Inc. (“WCI”), Alion – MA&D Corporation (“MA&D”), CS, and the lenders party thereto, related to the Credit Agreement (as amended from time to time) dated as of August 2, 2004, by and among the Company, HFA, METI, CATI, JJMA, BMH, WCI and MA&D, certain lenders from time to time party to the Credit Agreement (the “Lenders”), and CS, as administrative agent and as collateral agent for the Lenders.
10.84	Registration Rights Agreements dated February 8, 2007, by and between the Company and Credit Suisse Securities (USA) LLC.

3

SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: February 8, 2007

ALION SCIENCE AND TECHNOLOGY CORPORATION

By: /s/ James C. Fontana
Name: James C. Fontana
Title: General Counsel

4 EX-4.16 2 w30190exv4w16.htm EX-4.16

Exhibit 4.16

EXECUTION COPY

ALION SCIENCE AND TECHNOLOGY CORPORATION
Issuer

10¹/4 % Senior Notes due 2015

Subsidiary Guarantors
named herein

INDENTURE

Dated as of February 8, 2007

Wilmington Trust Company
Trustee

CROSS-REFERENCE TABLE

TIA	Indenture
Section	Section
310(a)(1)	7.10
(a)(2)	7.10
(a)(3)	N.A.
(a)(4)	N.A.
(b)	7.08; 7.10
(c)	N.A.
311(a)	7.11
(b)	7.11
(c)	N.A.
312(a)	2.05
(b)	10.03
(c)	10.03
313(a)	7.06
(b)(1)	N.A.
(b)(2)	7.06
(d)	7.06
314(a)	4.02; 4.09; 10.02
(b)	N.A.
(c)(1)	10.04
(c)(2)	10.04
(c)(3)	N.A.
(d)	N.A.
(e)	10.05
(f)	4.09
315(a)	7.01
(b)	7.05; 10.02
(c)	7.01
(d)	7.01
(e)	6.11
316(a)(last sentence)	10.0
(a)(1)(A)	6.05
(a)(1)(B)	6.04
(a)(2)	N.A.
(b)	6.07
317(a)(1)	6.08
(a)(2)	6.09
(b)	2.04
318(a)	10.01

N.A. means Not Applicable.

i

TABLE OF CONTENTS

		Page
Article 1
Definitions and Incorporation by Reference
SECTION 1.01.	Definitions.		1
SECTION 1.02.	Other Definitions.		27
SECTION 1.03.	Incorporation by Reference of Trust Indenture Act		27
SECTION 1.04.	Rules of Construction		27
Article 2
The Securities
SECTION 2.01.	Form and Dating		28
SECTION 2.02.	Execution and Authentication		29
SECTION 2.03.	Registrar and Paying Agent		29
SECTION 2.04.	Paying Agent To Hold Money in Trust		30
SECTION 2.05.	Securityholder Lists		30
SECTION 2.06.	Transfer and Exchange		30
SECTION 2.07.	Replacement Securities		30
SECTION 2.08.	Outstanding Securities		30
SECTION 2.09.	Temporary Securities		31
SECTION 2.10.	Cancellation		31
SECTION 2.11.	Defaulted Interest		31
SECTION 2.12.	CUSIP Numbers, ISINs, etc		31
SECTION 2.13.	Issuance of Additional Securities		32
Article 3
Redemption
SECTION 3.01.	Notices to Trustee		32
SECTION 3.02.	Selection of Securities to Be Redeemed		32
SECTION 3.03.	Notice of Redemption		33
SECTION 3.04.	Effect of Notice of Redemption		33
SECTION 3.05.	Deposit of Redemption Price		34
SECTION 3.06.	Securities Redeemed in Part		34
Article 4
Covenants
SECTION 4.01.	Payment of Securities		34
SECTION 4.02.	SEC Reports		34
SECTION 4.03.	Limitation on Indebtedness		35

ii

SECTION 4.04.	Limitation on Restricted Payments	39
SECTION 4.05.	Limitation on Restrictions on Distributions from Restricted Subsidiaries	43
SECTION 4.06.	Limitation on Sales of Assets and Subsidiary Stock	44
SECTION 4.07.	Limitation on Affiliate Transactions	47
SECTION 4.08.	Limitation on Line of Business	48
SECTION 4.09.	Change of Control	48
SECTION 4.10.	Limitation on Liens	50
SECTION 4.11.	Limitation on Sale/Leaseback Transactions	50
SECTION 4.12.	Future Guarantors	50
SECTION 4.13.	Compliance Certificate	50
SECTION 4.14.	Further Instruments and Acts	50
Article 5
Successor Company
SECTION 5.01.	When Company May Merge or Transfer Assets	51
Article 6
Defaults and Remedies
SECTION 6.01.	Events of Default	52
SECTION 6.02.	Acceleration	54
SECTION 6.03.	Other Remedies	55
SECTION 6.04.	Waiver of Past Defaults	55
SECTION 6.05.	Control by Majority	55
SECTION 6.06.	Limitation on Suits	55
SECTION 6.07.	Rights of Holders to Receive Payment	56
SECTION 6.08.	Collection Suit by Trustee	56
SECTION 6.09.	Trustee May File Proofs of Claim	56
SECTION 6.10.	Undertaking for Costs	57
SECTION 6.11.	Waiver of Stay or Extension Laws	57
Article 7
Trustee
SECTION 7.01.	Duties of Trustee	57
SECTION 7.02.	Rights of Trustee	58
SECTION 7.03.	Individual Rights of Trustee	59
SECTION 7.04.	Trustee’s Disclaimer	60
SECTION 7.05.	Notice of Defaults	60
SECTION 7.06.	Reports by Trustee to Holders	60
SECTION 7.07.	Compensation and Indemnity	60
SECTION 7.08.	Replacement of Trustee	61

iii

SECTION 7.09.	Successor Trustee by Merger	62
SECTION 7.10.	Eligibility; Disqualification	62
SECTION 7.11.	Preferential Collection of Claims Against Company	62
Article 8
Discharge of Indenture; Defeasance
SECTION 8.01.	Discharge of Liability on Securities; Defeasance	62
SECTION 8.02.	Conditions to Defeasance	63
SECTION 8.03.	Application of Trust Money	64
SECTION 8.04.	Repayment to Company	65
SECTION 8.05.	Indemnity for Government Obligations	65
SECTION 8.06.	Reinstatement	65
Article 9
Amendments
SECTION 9.01.	Without Consent of Holders	65
SECTION 9.02.	With Consent of Holders	66
SECTION 9.03.	Compliance with Trust Indenture Act	67
SECTION 9.04.	Revocation and Effect of Consents and Waivers	67
SECTION 9.05.	Notation on or Exchange of Securities	68
SECTION 9.06.	Trustee To Sign Amendments	68
SECTION 9.07.	Payment for Consent	68
Article 10
Subsidiary Guaranties
SECTION 10.01.	Guaranties	69
SECTION 10.02.	Limitation on Liability	70
SECTION 10.03.	Successors and Assigns	71
SECTION 10.04.	No Waiver	71
SECTION 10.05.	Modification	71
SECTION 10.06.	Release of Subsidiary Guarantor	71
SECTION 10.07.	Contribution	72
Article 11
Miscellaneous
SECTION 11.01.	Trust Indenture Act Controls	72
SECTION 11.02.	Notices	72
SECTION 11.03.	Communication by Holders with Other Holders	73
SECTION 11.04.	Certificate and Opinion as to Conditions Precedent	73
SECTION 11.05.	Statements Required in Certificate or Opinion	74

iv

SECTION 11.06.	When Securities Disregarded	74
SECTION 11.07.	Rules by Trustee, Paying Agent and Registrar	74
SECTION 11.08.	Legal Holidays	74
SECTION 11.09.	Governing Law	74
SECTION 11.10.	No Recourse Against Others	74
SECTION 11.11.	Successors	75
SECTION 11.12.	Multiple Originals	75
SECTION 11.13.	Table of Contents; Headings	75

Rule 144A/Regulation S Appendix

Exhibit 1 —	Form of Initial Security
Exhibit A —	Form of Exchange Security or Private Exchange Security

     INDENTURE dated as of February 8, 2007, among ALION SCIENCE AND TECHNOLOGY CORPORATION, a Delaware corporation (the “Company”), the Subsidiary Guarantors (as defined herein) and WILMINGTON TRUST COMPANY, a Delaware banking corporation, as Trustee (the “Trustee”).

          Each party agrees as follows for the benefit of the other parties and for the equal and ratable benefit of the Holders of the Initial Securities and, if and when issued pursuant to a registered exchange for Initial Securities, the Exchange Securities and if and when issued pursuant to a private exchange for Initial Securities, the Private Exchange Securities:

Article 1

Definitions and Incorporation by Reference

          SECTION 1.01. Definitions.

          “Additional Assets” means (1) any property, plant or equipment used in a Related Business; (2) the Capital Stock of a Person that becomes a Restricted Subsidiary as a result of the acquisition of such Capital Stock by the Company or another Restricted Subsidiary; or (3) Capital Stock constituting a minority interest in any Person that at such time is a Restricted Subsidiary; provided, however, that any such Restricted Subsidiary described in clause (2) or (3) above is primarily engaged in a Related Business.

          “Additional Securities” means Securities issued under this Indenture after the Issue Date and in compliance with Sections 2.13 and 4.03, it being understood that any Securities issued in exchange for or replacement of any Initial Security issued on the Issue Date shall not be an Additional Security, including any such Securities issued pursuant to a Registration Rights Agreement.

          “Adjusted EBITDA” means, for any period, Consolidated Net Income for such period plus (a) without duplication and to the extent deducted in determining such Consolidated Net Income, the sum of (i) Consolidated Interest Expense for such period, (ii) consolidated income tax expense for such period, (iii) all amounts attributable to depreciation and amortization for such period and (iv) any non-cash charges or expenses (other than the write-down of current assets) for such period, including (A) non-cash expenses associated with the recognition of the difference between the fair market value of the Junior Warrants and the exercise price of the Junior Warrants and (B) non-cash expenses with respect to the Junior Warrants and accretion of the Junior Warrants and minus (b) without duplication all cash payments made during such period on account of reserves, restructuring charges and other non-cash charges added to Consolidated Net Income pursuant to clause (a)(iv) above in a previous period.

          “Adjusted Treasury Rate” means, with respect to any redemption date, (i) the yield, under the heading which represents the average for the immediately

2

preceding week, appearing in the most recently published statistical release designated “H.15(519)” or any successor publication which is published weekly by the Board of Governors of the Federal Reserve System and which establishes yields on actively traded United States Treasury securities adjusted to constant maturity under the caption “Treasury Constant Maturities”, for the maturity corresponding to the Comparable Treasury Issue (if no maturity is within three months before or after February 1, 2011, yields for the two published maturities most closely corresponding to the Comparable Treasury Issue shall be determined and the Adjusted Treasury Rate shall be interpolated or extrapolated from such yields on a straight line basis, rounding to the nearest month) or (ii) if such release (or any successor release) is not published during the week preceding the calculation date or does not contain such yields, the rate per year equal to the semi-annual equivalent yield to maturity of the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such redemption date, in each case calculated on the third Business Day immediately preceding the redemption date, plus 0.50 %.

          “Affiliate” of any specified Person means any other Person, directly or indirectly, controlling or controlled by or under direct or indirect common control with such specified Person. For the purposes of this definition, “control” when used with respect to any Person means the power to direct the management and policies of such Person, directly or indirectly, whether through the ownership of voting securities, by contract or otherwise; and the terms “controlling” and “controlled” have meanings correlative to the foregoing. For purposes of Sections 4.04, 4.06 and 4.07 only, “Affiliate” shall also mean any beneficial owner of Capital Stock representing 5% or more of the total voting power of the Voting Stock (on a fully diluted basis) of the Company or of rights or warrants to purchase such Capital Stock (whether or not currently exercisable) and any Person who would be an Affiliate of any such beneficial owner pursuant to the first sentence hereof.

          “Applicable Premium” means with respect to a Security at any redemption date, the greater of (1) 1.00% of the principal amount of such Security and (2) the excess, if any, of (A) an amount equal to the present value at such redemption date of (i) the redemption price of such Security on February 1, 2011 (such redemption price being described in the fourth paragraph of section 5 of the Securities, exclusive of any accrued interest) plus (ii) all required remaining scheduled interest payments due on such Security through February 1, 2011 (but excluding accrued and unpaid interest to the redemption date), computed using a discount rate equal to the Adjusted Treasury Rate, over (B) the principal amount of such Security on such redemption date.

          “Asset Disposition” means any sale, lease, transfer or other disposition (or series of related sales, leases, transfers or dispositions) by the Company or any Restricted Subsidiary, including any disposition by means of a merger, consolidation or similar transaction (each referred to for the purposes of this definition as a “disposition”), of

     (1) any shares of Capital Stock of a Restricted Subsidiary (other than directors’ qualifying shares or shares required by applicable law to be held by a Person other than the Company or a Restricted Subsidiary);

3

     (2) all or substantially all the assets of any division or line of business of the Company or any Restricted Subsidiary; or

     (3) any other assets of the Company or any Restricted Subsidiary outside of the ordinary course of business of the Company or such Restricted Subsidiary

other than, in the case of clauses (1), (2) and (3) above, (A) a disposition by a Restricted Subsidiary to the Company or by the Company or a Restricted Subsidiary to a Restricted Subsidiary, (B) for purposes of Section 4.06 only, (i) a disposition that constitutes a Restricted Payment (or would constitute a Restricted Payment but for the exclusions from the definition thereof) and that is not prohibited by Section 4.04 and (ii) a disposition of all or substantially all the assets of the Company in accordance with Section 5.01, (C) a disposition of assets with a Fair Market Value of less than $500,000, (D) a disposition of cash or Temporary Cash Investments and (E) the creation of a Lien (but not the sale or other disposition of the property subject to such Lien).

          “Attributable Debt” in respect of a Sale/Leaseback Transaction means, as at the time of determination, the present value (discounted at the interest rate borne by the Securities, compounded annually) of the total obligations of the lessee for rental payments during the remaining term of the lease included in such Sale/Leaseback Transaction (including any period for which such lease has been extended); provided, however, that if such Sale/Leaseback Transaction results in a Capital Lease Obligation, the amount of Indebtedness represented thereby will be determined in accordance with the definition of “Capital Lease Obligation”.

          “Average Life” means, as of the date of determination, with respect to any Indebtedness, the quotient obtained by dividing (1) the sum of the products of the numbers of years from the date of determination to the dates of each successive scheduled principal payment of or redemption or similar payment with respect to such Indebtedness multiplied by the amount of such payment by (2) the sum of all such payments.

          “Board of Directors” with respect to a Person means the Board of Directors of such Person or any committee thereof duly authorized to act on behalf of such Board. Unless otherwise specified, the Board of Directors refers to the Board of Directors of the Company.

          “Business Day” means each day which is not a Legal Holiday.

          “Capital Lease Obligation” means an obligation that is required to be classified and accounted for as a capital lease for financial reporting purposes in accordance with GAAP, and the amount of Indebtedness represented by such obligation shall be the capitalized amount of such obligation determined in accordance with GAAP; and the Stated Maturity thereof shall be the date of the last payment of rent or any other amount due under such lease prior to the first date upon which such lease may be terminated by the lessee without payment of a penalty. For purposes of Section 4.10, a

4

Capital Lease Obligation will be deemed to be secured by a Lien on the property being leased.

          “Capital Stock” of any Person means any and all shares, interests (including partnership interests), rights to purchase, warrants, options, participations or other equivalents of or interests in (however designated) equity of such Person, including any Preferred Stock, phantom stock and stock appreciation rights, but excluding any debt securities convertible into such equity.

          “Change of Control” means the occurrence of any of the following events:

     (1) any “person” (as such term is used in Sections 13(d) and 14(d) of the Exchange Act), other than the Permitted Holder, is or becomes the beneficial owner (as defined in Rules 13d-3 and 13d-5 under the Exchange Act, except that such person shall be deemed to have “beneficial ownership” of all shares that any such person has the right to acquire, whether such right is exercisable immediately or only after the passage of time), directly or indirectly, of more than 35% of the total voting power of the Voting Stock of the Company; provided, however, that the Permitted Holder beneficially owns (as defined in 13d-3 and 13d-5 under the Exchange Act), directly or indirectly, in the aggregate a lesser percentage of the total voting power of the Voting Stock of the Company than such other person and does not have the right or ability by voting power, contract or otherwise to elect or designate for election a majority of the Board of Directors of the Company (for the purposes of this clause (1), such other person shall be deemed to beneficially own any Voting Stock of a specified person held by a parent entity, if such other person is the beneficial owner (as defined above in this clause (1)), directly or indirectly, of more than 35% of the voting power of the Voting Stock of such parent entity and the Permitted Holder beneficially owns (as defined in this proviso), directly or indirectly, in the aggregate a lesser percentage of the voting power of the Voting Stock of such parent entity and does not have the right or ability by voting power, contract or otherwise to elect or designate for election a majority of the board of directors of such parent entity);

     (2) individuals who on the Issue Date constituted the Board of Directors of the Company (together with any new directors whose election by such Board of Directors of the Company or whose nomination for election by the shareholders of the Company was approved by a vote of 66-2/3% of the directors of the Company, then still in office who were either directors on the Issue Date or whose election or nomination for election was previously so approved) cease for any reason to constitute a majority of the Board of Directors of the Company then in office;

     (3) the adoption of a plan relating to the liquidation or dissolution of the Company; and

     (4) the merger or consolidation of the Company with or into another Person or the merger of another Person with or into the Company, or the sale of

5

all or substantially all the assets of the Company (determined on a consolidated basis) to another Person other than (A) a transaction in which the survivor or transferee is a Person that is controlled by the Permitted Holders or (B) a transaction following which (i) in the case of a merger or consolidation transaction, holders of securities that represented 100% of the Voting Stock of the Company immediately prior to such transaction (or other securities into which such securities are converted as part of such merger or consolidation transaction) own directly or indirectly at least a majority of the voting power of the Voting Stock of the surviving Person in such merger or consolidation transaction immediately after such transaction and in substantially the same proportion as before the transaction and (ii) in the case of a sale of assets transaction, each transferee becomes an obligor in respect of the Securities and a Subsidiary of the transferor of such assets.

          “Code” means the Internal Revenue Code of 1986, as amended.

          “Company” means the party named as such in this Indenture until a successor replaces it and, thereafter, means the successor and, for purposes of any provision contained herein and required by the TIA, each other obligor on the indenture securities.

          “Comparable Treasury Issue” means, with respect to any redemption date, the United States Treasury security selected by the Quotation Agent as having a maturity comparable to the remaining term of the Securities from such redemption date to February 1, 2011, that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of a maturity most nearly equal to February 1, 2011.

          “Comparable Treasury Price” means, with respect to any redemption date, if clause (ii) of the Adjusted Treasury Rate is applicable, the average of three, or such lesser number as is obtained by the Trustee, Reference Treasury Dealer Quotations for such redemption date.

          “Consolidated Coverage Ratio” for any period means the ratio of (a) the aggregate amount of Adjusted EBITDA for such period to (b) Consolidated Interest Expense for such period payable in cash.

          “Consolidated Interest Expense” means, for any period, the sum of (a) the interest expense (excluding fees and any interest expense attributable to any accretion in the value of the Junior Warrants but including imputed interest expense in respect of Capital Lease Obligations and Synthetic Lease Obligations) of the Company and the Restricted Subsidiaries for such period, determined on a consolidated basis in accordance with GAAP, plus (b) any interest accrued during such period in respect of Indebtedness of the Company or any Restricted Subsidiary that is required to be capitalized rather than included in consolidated interest expense for such period in accordance with GAAP. For purposes of the foregoing, interest expense shall be determined after giving effect to any net payments made or received by the Company or any Restricted Subsidiary with

6

respect to Interest Rate Agreements. Consolidated Interest Expense does not include cash contributions to any employee stock ownership plan or similar trust to the extent such contributions are used by such plan or trust to pay interest or fees to any Person (other than the Company) in connection with Indebtedness incurred by such plan or trust.

          “Consolidated Net Income” means, for any period, the net income or loss of the Company and the Restricted Subsidiaries for such period determined on a consolidated basis in accordance with GAAP; provided that (a) there shall be excluded, in each case to the extent included in determining the net income or loss of the Company and the Restricted Subsidiaries for such period on a consolidated basis under GAAP, (i) the income of any Restricted Subsidiary to the extent that the declaration or payment of dividends or similar distributions by the Restricted Subsidiary of that income is not at the time permitted by operation of the terms of its charter or any agreement, instrument, judgment, decree, statute, rule or governmental regulation applicable to such Restricted Subsidiary, (ii) the income or loss of any Person accrued prior to the date it becomes a Restricted Subsidiary or is merged into or consolidated with the Company or any Restricted Subsidiary or the date that such Person’s assets are acquired by the Company or any Restricted Subsidiary, (iii) any gains attributable to sales of assets out of the ordinary course of business and the transaction costs in connection with such sales and (iv) any extraordinary or non-recurring gains or other income items and (b) there shall be added back, in each case to the extent deducted in determining the net income or loss of the Company and the Restricted Subsidiaries for such period on a consolidated basis under GAAP, (i) any non-cash compensation charge or expense including any such charge or expense relating to stock appreciation rights and phantom stock plans, (ii) any non-cash contributions to the ESOP, (iii) amortization of goodwill and other intangible assets, (iv) any losses attributable to sales of assets out of the ordinary course of business and the transaction costs in connection with such sales and (v) any extraordinary or non-recurring losses or charges.

          Notwithstanding the foregoing, for the purposes of Section 4.04 only, there shall be excluded from Consolidated Net Income any repurchases, repayments or redemptions of Investments, proceeds realized on the sale of Investments or return of capital of the Company or a Restricted Subsidiary to the extent such repurchases, repayments, redemptions, proceeds or returns increase the amount of Restricted Payments permitted under Section 4.04(a)(3)(D).

          “Currency Agreement” means any foreign exchange contract, currency swap agreement or other similar agreement with respect to currency values.

          “Default” means any event which is, or after notice or passage of time or both would be, an Event of Default.

          “Disqualified Stock” means, with respect to any Person, any Capital Stock which by its terms (or by the terms of any security into which it is convertible or for which it is exchangeable at the option of the holder) or upon the happening of any event:

7

     (1) matures or is mandatorily redeemable (other than redeemable only for Capital Stock of such Person which is not itself Disqualified Stock) pursuant to a sinking fund obligation or otherwise;

     (2) is convertible or exchangeable at the option of the holder for Indebtedness or Disqualified Stock; or

     (3) is mandatorily redeemable or must be purchased upon the occurrence of certain events or otherwise, in whole or in part,

in each case on or prior to the six-month anniversary of the Stated Maturity of the Securities; provided, however, that any Capital Stock that would not constitute Disqualified Stock but for provisions thereof giving holders thereof the right to require such Person to purchase or redeem such Capital Stock upon the occurrence of an “asset sale” or “change of control” occurring prior to the six-month anniversary of the Stated Maturity of the Securities shall not constitute Disqualified Stock if (A) the “asset sale” or “change of control” provisions applicable to such Capital Stock are not more favorable to the holders of such Capital Stock than the terms applicable to the Securities in Sections 4.06 and 4.09 of this Indenture and (B) any such requirement only becomes operative after compliance with such terms applicable to the Securities, including the purchase of any Securities tendered pursuant thereto.

          The amount of any Disqualified Stock that does not have a fixed redemption, repayment or repurchase price will be calculated in accordance with the terms of such Disqualified Stock as if such Disqualified Stock were redeemed, repaid or repurchased on any date on which the amount of such Disqualified Stock is to be determined pursuant to this Indenture; provided, however, that if such Disqualified Stock could not be required to be redeemed, repaid or repurchased at the time of such determination, the redemption, repayment or repurchase price will be the book value of such Disqualified Stock as reflected in the most recent financial statements of such Person.

          “Domestic Restricted Subsidiary” means any Restricted Subsidiary other than a Foreign Subsidiary.

          “ESOP” means the employee benefit plan entitled “The Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan” adopted and maintained by the Company and as in effect on the Issue Date and as may be amended as required by a change in applicable law after the Issue Date.

          “ESOP Plan Documents” means collectively, the governing agreements and other documents and instruments of the ESOP, in each case as in effect on the Issue Date and as may be amended as required by a change in applicable law after the Issue Date.

          “ESOT” means the trust entitled “The Alion Science and Technology Corporation Employee Ownership, Savings and Investment Trust” and adopted and maintained by the Company pursuant to the applicable ESOP Plan Documents, as in

8

effect on the Issue Date and as may be amended as required by a change in applicable law after the Issue Date.

          “Exchange Act” means the U.S. Securities Exchange Act of 1934, as amended.

          “Exchange Securities” means the debt securities of the Company issued pursuant to this Indenture in exchange for, and in an aggregate principal amount not to exceed, the Initial Securities, in compliance with the terms of the Registration Rights Agreement.

          “Fair Market Value” means, with respect to any asset or property, the price which could be negotiated in an arm’s length, free market transaction, for cash, between a willing seller and a willing and able buyer, neither of whom is under undue pressure or compulsion to complete the transaction. Fair Market Value will be determined in good faith by the Board of Directors, whose determination will be conclusive and evidenced by a resolution of such Board of Directors.

          “Foreign Subsidiary” means any Restricted Subsidiary of the Company that is not organized under the laws of the United States of America or any State thereof or the District of Columbia.

          “Former JSC Participant” means the employees of the Company or any of its Subsidiaries that primarily provided services under the Joint Spectrum Center (JSC) Engineering Support Services contract and were voluntarily or involuntarily terminated during the JSC Termination Period in connection with the Company’s failure to receive the follow-on support contract with respect to such contract.

          “GAAP” means generally accepted accounting principles in the United States of America as in effect as of the Issue Date, including those set forth in

     (1) the opinions and pronouncements of the Accounting Principles Board of the American Institute of Certified Public Accountants;

     (2) statements and pronouncements of the Financial Accounting Standards Board;

     (3) such other statements by such other entity as approved by a significant segment of the accounting profession; and

     (4) the rules and regulations of the SEC governing the inclusion of financial statements (including pro forma financial statements) in periodic reports required to be filed pursuant to Section 13 of the Exchange Act, including opinions and pronouncements in staff accounting bulletins and similar written statements from the accounting staff of the SEC.

All ratios and computations based on GAAP contained in this Indenture shall be computed in conformity with GAAP.

9

          “Guarantee” means any obligation, contingent or otherwise, of any Person directly or indirectly guaranteeing any Indebtedness of any Person and any obligation, direct or indirect, contingent or otherwise, of such Person

     (1) to purchase or pay (or advance or supply funds for the purchase or payment of) such Indebtedness of such Person (whether arising by virtue of partnership arrangements, or by agreements to keep-well, to purchase assets, goods, securities or services, to take-or-pay or to maintain financial statement conditions or otherwise); or

     (2) entered into for the purpose of assuring in any other manner the obligee of such Indebtedness of the payment thereof or to protect such obligee against loss in respect thereof (in whole or in part);

provided, however, that the term “Guarantee” shall not include endorsements for collection or deposit in the ordinary course of business. The term “Guarantee” used as a verb has a corresponding meaning. The term “Guarantor” shall mean any Person Guaranteeing any obligation.

          “Guaranty Agreement” means a supplemental indenture, in a form reasonably satisfactory to the Trustee, pursuant to which a Subsidiary Guarantor guarantees the Company’s obligations under this Indenture and with respect to the Securities on the terms provided for in Article 10 of this Indenture.

          “Hedging Obligations” of any Person means the obligations of such Person pursuant to any Interest Rate Agreement or Currency Agreement.

          “Holder” or “Securityholder” means the Person in whose name a Security is registered on the Registrar’s books.

          “IIT” means Illinois Institute of Technology, an Illinois not-for-profit corporation.

          “IITRI” means IIT Research Institute, a not-for-profit Illinois corporation controlled by IIT.

          “Incur” means issue, assume, Guarantee, incur or otherwise become liable for; provided, however, that any Indebtedness of a Person existing at the time such Person becomes a Restricted Subsidiary (whether by merger, consolidation, acquisition or otherwise) shall be deemed to be Incurred by such Person at the time it becomes a Restricted Subsidiary. The term “Incurrence” when used as a noun shall have a correlative meaning. Solely for purposes of determining compliance with Section 4.03:

     (1) amortization of debt discount or the accretion of principal with respect to a non-interest bearing or other discount security;

     (2) the payment of regularly scheduled interest in the form of additional Indebtedness of the same instrument or the payment of regularly

10

scheduled dividends on Capital Stock in the form of additional Capital Stock of the same class and with the same terms; and

     (3) the obligation to pay a premium in respect of Indebtedness arising in connection with the issuance of a notice of redemption or the making of a mandatory offer to purchase such Indebtedness,

will not be deemed to be the Incurrence of Indebtedness.

          “Indebtedness” means, with respect to any Person on any date of determination (without duplication):

     (1) the principal in respect of (A) indebtedness of such Person for money borrowed and (B) indebtedness evidenced by notes, debentures, bonds or other similar instruments for the payment of which such Person is responsible or liable, including, in each case, any premium on such indebtedness to the extent such premium has become due and payable;

     (2) all Capital Lease Obligations of such Person and all Attributable Debt in respect of Sale/Leaseback Transactions entered into by such Person;

     (3) all obligations of such Person issued or assumed as the deferred purchase price of property, all conditional sale obligations of such Person and all obligations of such Person under any title retention agreement (but excluding any accounts payable or other liability to trade creditors arising in the ordinary course of business);

     (4) all obligations of such Person for the reimbursement of any obligor on any letter of credit, bankers’ acceptance or similar credit transaction (other than obligations with respect to letters of credit securing obligations (other than obligations described in clauses (1) through (3) above) entered into in the ordinary course of business of such Person to the extent such letters of credit are not drawn upon or, if and to the extent drawn upon, such drawing is reimbursed no later than the tenth Business Day following payment on the letter of credit);

     (5) the amount of all obligations of such Person with respect to the redemption, repayment or other repurchase of any Disqualified Stock of such Person or, with respect to any Preferred Stock of any Subsidiary of such Person, the principal amount of such Preferred Stock to be determined in accordance with this Indenture (but excluding, in each case, any accrued dividends);

     (6) all obligations of the type referred to in clauses (1) through (5) of other Persons and all dividends of other Persons for the payment of which, in either case, such Person is responsible or liable, directly or indirectly, as obligor, guarantor or otherwise, including by means of any Guarantee;

     (7) all obligations of the type referred to in clauses (1) through (6) of other Persons secured by any Lien on any property or asset of such Person

11

(whether or not such obligation is assumed by such Person), the amount of such obligation being deemed to be the lesser of the Fair Market Value of such property or assets and the amount of the obligation so secured; and

     (8) to the extent not otherwise included in this definition, Hedging Obligations of such Person.

Notwithstanding the foregoing, in connection with the purchase by the Company or any Restricted Subsidiary of any business, the term “Indebtedness” will exclude post-closing payment adjustments to which the sellers may become entitled to the extent such payment is determined by a final closing balance sheet or such payment depends on the performance of such business after the closing; provided, however, that, at the time of closing, the amount of any such payment is not determinable and, to the extent such payment thereafter becomes fixed and determined, the amount is paid within 30 days thereafter.

          The amount of Indebtedness of any Person at any date shall be the outstanding balance at such date of all obligations as described above but without duplication or double-counting of any Indebtedness described in two or more clauses above; provided, however, that in the case of Indebtedness sold at a discount, the amount of such Indebtedness at any time will be the accreted value thereof at such time. The Junior Warrants shall constitute Indebtedness of the Company.

          “Indenture” means this Indenture as amended or supplemented from time to time.

          “Independent Qualified Party” means an investment banking firm, accounting firm or appraisal firm of national standing; provided, however, that such firm is not an Affiliate of the Company.

          “Interest Rate Agreement” means any interest rate swap agreement, interest rate cap agreement or other financial agreement or arrangement with respect to exposure to interest rates.

          “Investment” in any Person means any direct or indirect advance, loan (other than advances to customers in the ordinary course of business that are recorded as accounts receivable on the balance sheet of the lender) or other extensions of credit (including by way of Guarantee or similar arrangement) or capital contribution to (by means of any transfer of cash or other property to others or any payment for property or services for the account or use of others), or any purchase or acquisition of Capital Stock, Indebtedness or other similar instruments issued by such Person. If the Company or any Restricted Subsidiary issues, sells or otherwise disposes of any Capital Stock of a Person that is a Restricted Subsidiary such that, after giving effect thereto, such Person is no longer a Restricted Subsidiary, any Investment by the Company or any Restricted Subsidiary in such Person remaining after giving effect thereto will be deemed to be a new Investment at such time. The acquisition by the Company or any Restricted Subsidiary of a Person that holds an Investment in a third Person will be deemed to be an

12

Investment by the Company or such Restricted Subsidiary in such third Person at such time. Except as otherwise provided for herein, the amount of an Investment shall be its Fair Market Value at the time the Investment is made and without giving effect to subsequent changes in value.

          For purposes of the definition of “Unrestricted Subsidiary”, the definition of “Restricted Payment” and Section 4.04, “Investment” shall include

     (1) the portion (proportionate to the Company’s equity interest in such Subsidiary) of the Fair Market Value of the net assets of any Subsidiary of the Company at the time that such Subsidiary is designated an Unrestricted Subsidiary; provided, however, that upon a redesignation of such Subsidiary as a Restricted Subsidiary, the Company shall be deemed to continue to have a permanent “Investment” in an Unrestricted Subsidiary equal to an amount (if positive) equal to (A) the Company’s “Investment” in such Subsidiary at the time of such redesignation less (B) the portion (proportionate to the Company’s equity interest in such Subsidiary) of the Fair Market Value of the net assets of such Subsidiary at the time of such redesignation; and

     (2) any property transferred to or from an Unrestricted Subsidiary shall be valued at its Fair Market Value at the time of such transfer, in each case as determined in good faith by the Board of Directors of the Company.

     “Issue Date” means February 8, 2007.

     “JSC Termination Period” means the period beginning on July 1, 2006 and ending on December 31, 2006.

     “Junior Subordinated Note” means the Company’s 6% Seller Subordinated Notes due December 20, 2010 in an outstanding aggregate principal amount on the Issue Date of approximately $39,900,000, together with additional Seller Subordinated Notes issued in lieu of cash interest thereon in accordance with the terms thereof.

     “Junior Warrants” means an aggregate of 1,080,437 detachable redeemable common stock warrants issued to the holders of the Junior Subordinated Notes.

     “Legal Holiday” means a Saturday, a Sunday or a day on which banking institutions are not required to be open in the State of New York.

     “Lien” means any mortgage, pledge, security interest, encumbrance, lien or charge of any kind (including any conditional sale or other title retention agreement or lease in the nature thereof).

     “Moody’s” means Moody’s Investors Service, Inc. and any successor to its rating agency business.

13

          “Net Available Cash” from an Asset Disposition means cash payments received therefrom (including any cash payments received by way of deferred payment of principal pursuant to a note or installment receivable or otherwise and proceeds from the sale or other disposition of any securities received as consideration, but only as and when received, but excluding any other consideration received in the form of assumption by the acquiring Person of Indebtedness or other obligations relating to such properties or assets or received in any other non-cash form), in each case net of

     (1) all direct costs relating to such Asset Disposition, including legal, investment banking, accounting, title and recording tax expenses, commissions and other fees and expenses incurred, and all Federal, state, provincial, foreign and local taxes required to be accrued as a liability under GAAP, as a consequence of such Asset Disposition;

     (2) all payments (whether principal, interest, premium or other) made on any Indebtedness which is secured by any assets subject to such Asset Disposition or required to be repaid as a result of the Asset Disposition, in accordance with the terms of any Lien upon or other security agreement of any kind with respect to such assets or other agreement with respect to such Indebtedness, or which must by its terms, or in order to obtain a necessary consent to such Asset Disposition, or by applicable law, be repaid out of the proceeds from such Asset Disposition;

     (3) all distributions and other payments required to be made to minority interest holders in Restricted Subsidiaries as a result of such Asset Disposition;

     (4) the deduction of appropriate amounts provided by the seller as a reserve, in accordance with GAAP, against any liabilities associated with the property or other assets disposed in such Asset Disposition and retained by the Company or any Restricted Subsidiary after such Asset Disposition, including indemnification liabilities, purchase price adjustments, and employee benefit plan liabilities; and

     (5) any portion of the purchase price from an Asset Disposition placed in escrow, whether as a reserve for adjustment of the purchase price, for satisfaction of indemnities in respect of such Asset Disposition or otherwise in connection with that Asset Disposition; provided, however, that upon the termination of that escrow, Net Available Cash will be increased by any portion of funds in the escrow that are released to the Company or any Restricted Subsidiary.

          “Net Cash Proceeds”, with respect to any issuance or sale of Capital Stock or Indebtedness, means the cash proceeds of such issuance or sale net of attorneys’ fees, accountants’ fees, underwriters’ or placement agents’ fees, discounts or commissions and brokerage, consultant and other fees actually incurred in connection with such issuance or sale and net of taxes paid or payable as a result thereof.

14

          “Obligations” means with respect to any Indebtedness, all obligations for principal, premium, interest, penalties, fees, indemnifications, reimbursements, and other amounts payable pursuant to the documentation governing such Indebtedness.

          “Officer” means the Chairman of the Board, the Chief Executive Officer, the President, the Chief Financial Officer, any Vice President, the Treasurer or the Secretary of the Company.

          “Officers’ Certificate” means a certificate signed by an Officer.

          “Opinion of Counsel” means a written opinion from legal counsel who is acceptable to the Trustee. The counsel may be an employee of or counsel to the Company or the Trustee. Any such opinion may contain customary carveouts and assumptions, may rely upon factual information received from the Company, the Subsidiaries and other third parties, and may be qualified as to knowledge (as customarily defined) with respect to any conclusions or opinions that are factual in nature.

          “Permitted Acquisition” means the acquisition by the Company or any Restricted Subsidiary of all or substantially all of the assets of a Person, a line of business or division of a Person or not less than 100% of the Capital Stock of a Person (the “Acquired Entity”); provided that (a) such acquisition was not preceded by an unsolicited tender offer for such Capital Stock by, or proxy contest initiated by, the Company or any Subsidiary of the Company; (b) the Acquired Entity or the assets, line of business or division acquired shall be in a similar line of business as that of the Company and its Subsidiaries as conducted during the current and most recent calendar year; (c) (i) the Acquired Entity or division is located, and substantially all of its operations are conducted, in the United States of America or (ii) substantially all of the assets acquired are located in the United States; (d) at the time of such transaction both before and after giving effect thereto, no Default or Event of Default shall have occurred and be continuing; and (e) the Company shall have delivered to the Trustee a certificate of the chief financial officer of the Company confirming compliance with clauses (a) through (d) above, together with all relevant financial information for the Acquired Entity, acquired line of business or division or acquired assets and reasonably detailed calculations demonstrating satisfaction of the requirements set forth in clauses (a) through (d) above.

          “Permitted ESOP Transactions” means the redemption or repurchase for value of any Capital Stock of the Company as a result of distributions by the ESOT to participants in the ESOP to satisfy diversification requirements under applicable law, including section 401(a)(28) of the Code.

          “Permitted Holder” means the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Trust.

15

          “Permitted Investment” means an Investment by the Company or any Restricted Subsidiary in:

     (1) the Company, a Restricted Subsidiary or a Person that will, upon the making of such Investment, become a Restricted Subsidiary; provided, however, that the primary business of such Restricted Subsidiary is a Related Business;

     (2) another Person, if as a result of such Investment, such other Person is merged or consolidated with or into, or transfers or conveys all or substantially all its assets to, the Company or a Restricted Subsidiary; provided, however, that such Person’s primary business is a Related Business;

     (3) cash and Temporary Cash Investments;

     (4) receivables owing to the Company or any Restricted Subsidiary if created or acquired in the ordinary course of business and payable or dischargeable in accordance with customary trade terms; provided, however, that such trade terms may include such concessionary trade terms as the Company or any such Restricted Subsidiary deems reasonable under the circumstances;

     (5) payroll, travel and similar advances to cover matters that are expected at the time of such advances ultimately to be treated as expenses for accounting purposes and that are made in the ordinary course of business;

     (6) loans or advances to employees made in the ordinary course of business consistent with past practices of the Company or such Restricted Subsidiary;

     (7) stock, obligations or securities received in settlement of debts created in the ordinary course of business and owing to the Company or any Restricted Subsidiary or in satisfaction of judgments;

     (8) any Person to the extent such Investment represents the non-cash portion of the consideration received for (i) an Asset Disposition as permitted pursuant to Section 4.06 or (ii) a disposition of assets not constituting an Asset Disposition;

     (9) any Person where such Investment was acquired by the Company or any of its Restricted Subsidiaries (a) in exchange for any other Investment or accounts receivable held by the Company or any such Restricted Subsidiary in connection with or as a result of a bankruptcy, workout, reorganization or recapitalization of the issuer of such other Investment or accounts receivable or (b) as a result of a foreclosure by the Company or any of its Restricted Subsidiaries with respect to any secured Investment or other transfer of title with respect to any secured Investment in default;

16

     (10) any Person to the extent such Investments consist of prepaid expenses, negotiable instruments held for collection and lease, utility and workers’ compensation, performance and other similar deposits made in the ordinary course of business by the Company or any Restricted Subsidiary;

     (11) any Person to the extent such Investments consist of Hedging Obligations otherwise permitted under Section 4.03;

     (12) any Person to the extent such Investment exists on the Issue Date, and any extension, modification or renewal of any such Investments existing on the Issue Date, but only to the extent not involving additional advances, contributions or other Investments of cash or other assets or other increases thereof (other than as a result of the accrual or accretion of interest or original issue discount or the issuance of pay-in-kind securities, in each case, pursuant to the terms of such Investment as in effect on the Issue Date).

          “Permitted Liens” means, with respect to any Person:

     (1) Liens securing Indebtedness Incurred to finance the construction, purchase or lease of, or repairs, improvements or additions to, property, plant or equipment of such Person; provided, however, that the Lien may not extend to any other property owned by such Person or any of its Restricted Subsidiaries at the time the Lien is Incurred (other than assets and property affixed or appurtenant thereto), and the Indebtedness (other than any interest thereon) secured by the Lien may not be Incurred more than 180 days after the later of the acquisition, completion of construction, repair, improvement, addition or commencement of full operation of the property subject to the Lien;

     (2) Liens to secure Indebtedness to the extent the principal amount of such Indebtedness, when added together with all other Secured Indebtedness of the Company and its Restricted Subsidiaries then outstanding, would not cause the Secured Indebtedness Ratio to exceed 3.5 to 1.0;

     (3) Liens existing on the Issue Date;

     (4) Liens on property or shares of Capital Stock of another Person at the time such other Person becomes a Subsidiary of such Person; provided, however, that the Liens may not extend to any other property owned by such Person or any of its Restricted Subsidiaries (other than assets and property affixed or appurtenant thereto), and the Indebtedness (other than any interest thereon) secured by the Lien may not be Incurred more than 180 days after the time such other Person becomes a Subsidiary of such Person;

     (5) Liens on property at the time such Person or any of its Subsidiaries acquires the property, including any acquisition by means of a merger or consolidation with or into such Person or a Subsidiary of such Person; provided, however, that the Liens may not extend to any other property owned by such Person or any of its Restricted Subsidiaries (other than assets and property affixed

17

or appurtenant thereto), and the Indebtedness (other than any interest thereon) secured by the Lien may not be Incurred more than 180 days after the acquisition of the property subject to such Lien;

     (6) Liens securing Indebtedness or other obligations of a Subsidiary of such Person owing to such Person or a Restricted Subsidiary of such Person;

     (7) Liens securing Hedging Obligations so long as such Hedging Obligations are permitted to be Incurred under this Indenture;

     (8) Liens on specific items of inventory or other goods and proceeds of any Person securing such Person’s obligations in respect of bankers’ acceptances issued or created for the account of such Person to facilitate the purchase, shipment or storage of such inventory or other goods;

     (9) Liens arising from Uniform Commercial Code financing statement filings regarding operating leases entered into by the Company and its Restricted Subsidiaries in the ordinary course of business;

     (10) Liens in favor of the Company or any Subsidiary Guarantor or Liens on assets of a Restricted Subsidiary of the Company entered that is not a guarantor in favor solely of another Restricted Subsidiary of the Company that is not a Subsidiary Guarantor;

     (11) Liens to secure any Refinancing (or successive Refinancings) as a whole, or in part, of any Indebtedness secured by any Lien referred to in the foregoing clause (1), (3), (4) or (5); provided, however, that:

     (A) such new Lien shall be limited to all or part of the same property and assets that secured or, under the written agreements pursuant to which the original Lien arose, could secure the original Lien (plus improvements and accessions to, such property or proceeds or distributions thereof); and

     (B) the Indebtedness secured by such Lien at such time is not increased to any amount greater than the sum of (i) the outstanding principal amount or, if greater, committed amount of the Indebtedness described under clause (1), (3), (4) or (5) at the time the original Lien became a Permitted Lien and (ii) an amount necessary to pay any fees and expenses, including premiums, related to such refinancing, refunding, extension, renewal or replacement;

     (12) Liens securing Indebtedness of Foreign Subsidiaries permitted to be Incurred under this Indenture, to the extent such Liens relate only to assets and properties of Foreign Subsidiaries;

     (13) zoning restrictions, easements, rights-of-way, restrictions on use of real property and other similar encumbrances incurred in the ordinary course of

18

business which, in the aggregate, do not materially detract from the value of the property subject thereto or interfere with the ordinary conduct of the business of the Company or any Restricted Subsidiary;

     (14) licenses, leases or subleases granted by the Company or any Restricted Subsidiary to third persons in the ordinary course of business not interfering in any material respect with the business of the Company or any Restricted Subsidiary;

     (15) deposits to secure the performance of bids, trade contracts (other than for Indebtedness), leases (other than Capital Lease Obligations), statutory obligations, surety and appeal bonds, performance bonds and other obligations of a like nature incurred in the ordinary course of business;

     (16) Liens arising out of judgments or awards in respect of which the Company or any Restricted Subsidiary shall in good faith be prosecuting an appeal or proceedings for review in respect of which there shall be secured a subsisting stay of execution pending such appeal or proceedings; provided that the aggregate amount of all such judgments or awards (and any cash and the fair market value of any property subject to such Liens) does not exceed $30,000,000 at any time outstanding;

     (17) Liens for taxes not yet due or which are being contested in good faith by appropriate proceedings and with respect to which the Company shall have set aside on its books adequate reserves in accordance with GAAP and such contest operates to suspend collection of the contested tax and enforcement of the applicable Lien;

     (18) carriers’, warehousemen’s, mechanics’, materialmen’s, repairmen’s or other like Liens arising in the ordinary course of business and securing obligations that are not due and payable or which are being contested in good faith by appropriate proceedings and with respect to which the Company shall have set aside on its books adequate reserves in accordance with GAAP and such contest operates to suspend collection of the contested obligations and enforcement of the applicable Lien;

     (19) pledges and deposits made in the ordinary course of business in compliance with workmen’s compensation, unemployment insurance and other social security laws or regulations; and

     (20) other Liens securing obligations incurred in the ordinary course of business which obligations, in the aggregate, do not exceed $5,000,000 at any time.

For purposes of this definition, the term “Indebtedness” shall be deemed to include interest on such Indebtedness.

19

          “Permitted Subordinated Indebtedness” means Indebtedness of the Company or any Restricted Subsidiary (a) that is not Secured Indebtedness, (b) that constitutes Subordinated Obligations, (c) that is not incurred while a Default exists, (d) the incurrence of which would not result in a Default and (e) that does not mature and does not require any payment of principal prior to the final maturity date of the Securities.

          “Person” means any individual, corporation, partnership, limited liability company, joint venture, association, joint-stock company, trust, unincorporated organization, government or any agency or political subdivision thereof or any other entity.

          “Preferred Stock”, as applied to the Capital Stock of any Person, means Capital Stock of any class or classes (however designated) which is preferred as to the payment of dividends or distributions, or as to the distribution of assets upon any voluntary or involuntary liquidation or dissolution of such Person, over shares of Capital Stock of any other class of such Person.

          “principal” of a Security means the principal of the Security plus the premium, if any, payable on the Security which is due or overdue or is to become due at the relevant time.

          “Qualified Capital Stock” of a Person means Capital Stock of such Person other than Disqualified Capital Stock; provided, however, that such Capital Stock shall not be deemed Qualified Capital Stock to the extent sold to a Subsidiary of such Person or financed, directly or indirectly, using funds (1) borrowed from such Person or any Subsidiary of such Person or (2) contributed, extended, guaranteed or advanced by such Person or any Subsidiary of such Person (including, in respect of any employee stock ownership or benefit plan). Unless otherwise specified, Qualified Capital Stock refers to Qualified Capital Stock of the Company.

          “Qualified Equity Offering” means any issuance and sale of common stock by the Company. Notwithstanding the foregoing, the term “Qualified Equity Offering” shall not include:

     (1) any issuance and sale with respect to the Company’s common stock registered on Form S-4 or Form S-8; or

     (2) any issuance and sale to any Subsidiary of the Company.

          “Quotation Agent” means the Reference Treasury Dealer selected by the Trustee after consultation with the Company.

          “Reference Treasury Dealer” means Credit Suisse Securities (USA) LLC and its successors and assigns and two other nationally recognized investment banking firms selected by the Company that are primary U.S. Government securities dealers.

20

          “Reference Treasury Dealer Quotations” means with respect to each Reference Treasury Dealer and any redemption date, the average, as calculated by the Quotation Agent, of the bid and asked prices for the Comparable Treasury Issue, expressed in each case as a percentage of its principal amount, quoted in writing to the Quotation Agent by such Reference Treasury Dealer at 5:00 p.m., New York City time, on the third Business Day immediately preceding such redemption date.

          “Refinance” means, in respect of any Indebtedness, to refinance, extend, renew, refund, repay, prepay, redeem, purchase, defease or retire, or to issue other Indebtedness in exchange or replacement for, such Indebtedness. “Refinanced” and “Refinancing” shall have correlative meanings.

          “Refinancing Indebtedness” means Indebtedness that Refinances any Indebtedness of the Company or any Restricted Subsidiary existing on the Issue Date or Incurred in compliance with this Indenture, including Indebtedness that Refinances Refinancing Indebtedness; provided, however, that:

     (1) such Refinancing Indebtedness has a Stated Maturity no earlier than the Stated Maturity of the Indebtedness being Refinanced;

     (2) such Refinancing Indebtedness has an Average Life at the time such Refinancing Indebtedness is Incurred that is equal to or greater than the Average Life of the Indebtedness being Refinanced;

     (3) such Refinancing Indebtedness has an aggregate principal amount (or if Incurred with original issue discount, an aggregate issue price) that is equal to or less than the aggregate principal amount (or if Incurred with original issue discount, the aggregate accreted value) then outstanding (plus fees and expenses, including any premium and defeasance costs) under the Indebtedness being Refinanced; and

     (4) if the Indebtedness being Refinanced is subordinated in right of payment to the Securities or a Subsidiary Guarantee, such Refinancing Indebtedness, (a) if Refinancing the Junior Subordinated Note or the Junior Warrants, is subordinated in right of payment to the Securities and (b) if Refinancing any other Indebtedness, is subordinated in right of payment to the Securities at least to the same extent as the Indebtedness being Refinanced;

provided further, however, that Refinancing Indebtedness shall not include (A) Indebtedness of a Subsidiary (other than a Subsidiary Guarantor) that Refinances Indebtedness of the Company or (B) Indebtedness of the Company or a Restricted Subsidiary that Refinances Indebtedness of an Unrestricted Subsidiary.

          “Registration Rights Agreement” means the Registration Rights Agreement dated February 8, 2007, among the Company, the Subsidiary Guarantors and Credit Suisse Securities (USA) LLC.

21

          “Related Business” means any business in which the Company or any of the Restricted Subsidiaries was engaged on the Issue Date and any business reasonably related, ancillary or complementary to such business and any business providing products or services to any government, governmental authority or agency, department or bureau thereof.

          “Restricted Payment” with respect to any Person means:

     (1) the declaration or payment of any dividends or any other distributions of any sort in respect of its Capital Stock (including any payment in connection with any merger or consolidation involving such Person) or similar payment to the direct or indirect holders of its Capital Stock (other than (A) dividends or distributions payable solely in its Capital Stock (other than Disqualified Stock), (B) dividends or distributions payable solely to the Company or a Restricted Subsidiary and (C) pro rata dividends or other distributions made by a Subsidiary that is not a Wholly Owned Subsidiary to minority stockholders (or owners of an equivalent interest in the case of a Subsidiary that is an entity other than a corporation));

     (2) the purchase, repurchase, redemption, defeasance or other acquisition or retirement for value of any Capital Stock of the Company held by any Person (other than by a Restricted Subsidiary) or of any Capital Stock of a Restricted Subsidiary held by any Affiliate of the Company (other than by a Restricted Subsidiary), including in connection with any merger or consolidation and including the exercise of any option to exchange any Capital Stock (other than into Capital Stock of the Company that is not Disqualified Stock);

     (3) the purchase, repurchase, redemption, defeasance or other acquisition or retirement for value, prior to scheduled maturity, scheduled repayment or scheduled sinking fund payment of any Subordinated Obligations of the Company or any Subsidiary Guarantor (other than (A) from the Company or a Restricted Subsidiary or (B) the purchase, repurchase, redemption, defeasance or other acquisition or retirement of Subordinated Obligations purchased in anticipation of satisfying a sinking fund obligation, principal installment or final maturity, in each case due within one year of the date of such purchase, repurchase, redemption, defeasance or other acquisition or retirement); or

     (4) the making of any Investment (other than a Permitted Investment) in any Person.

          “Restricted Subsidiary” means any Subsidiary of the Company that is not an Unrestricted Subsidiary.

          “Sale/Leaseback Transaction” means an arrangement relating to property owned by the Company or a Restricted Subsidiary on the Issue Date or thereafter acquired by the Company or a Restricted Subsidiary whereby the Company or a

22

Restricted Subsidiary transfers such property to a Person and the Company or a Restricted Subsidiary leases it from such Person.

          “SEC” means the U.S. Securities and Exchange Commission.

          “Secured Indebtedness” means any Indebtedness of the Company and the Restricted Subsidiaries secured by a Lien.

          “Securities Act” means the U.S. Securities Act of 1933, as amended.

          “Senior Indebtedness” means with respect to any Person:

     (1) Indebtedness of such Person, whether outstanding on the Issue Date or thereafter Incurred; and

     (2) all other Obligations of such Person (including interest accruing on or after the filing of any petition in bankruptcy or for reorganization relating to such Person whether or not post-filing interest is allowed in such proceeding) in respect of Indebtedness described in clause (1) above

unless, in the case of clauses (1) and (2), in the instrument creating or evidencing the same or pursuant to which the same is outstanding, it is provided that such Indebtedness or other Obligations are subordinate in right of payment to the Securities or the Subsidiary Guaranty of such Person, as the case may be; provided, however, that Senior Indebtedness shall not include:

     (A) any obligation of such Person to the Company or any Subsidiary;

     (B) any liability for Federal, state, local or other taxes owed or owing by such Person;

     (C) any accounts payable or other liability to trade creditors arising in the ordinary course of business;

     (D) any Indebtedness or other Obligation of such Person which is subordinate or junior in any respect to any other Indebtedness or other Obligation of such Person; or

     (E) that portion of any Indebtedness which at the time of Incurrence is Incurred in violation of this Indenture.

          “Secured Indebtedness Ratio” means, as of any date of determination, the ratio of (a) all Secured Indebtedness of the Company and its Restricted Subsidiaries outstanding on such date, including any Secured Indebtedness to be Incurred on such date, to (b) the aggregate amount of Adjusted EBITDA for the period of the most recent four consecutive fiscal quarters ending at least 45 days prior to the date of such determination.

23

          “Significant Subsidiary” means any Restricted Subsidiary that would be a “Significant Subsidiary” of the Company within the meaning of Rule 1-02 under Regulation S-X promulgated by the SEC.

          “Standard & Poor’s” means Standard & Poor’s, a division of The McGraw-Hill Companies, Inc., and any successor to its rating agency business.

          “Stated Maturity” means, with respect to any security, the date specified in such security as the fixed date on which the final payment of principal of such security is due and payable, including pursuant to any mandatory redemption provision (but excluding any provision providing for the repurchase of such security at the option of the holder thereof upon the happening of any contingency unless such contingency has occurred).

          “Subordinated Obligation” means, with respect to a Person, any Indebtedness of such Person (whether outstanding on the Issue Date or thereafter Incurred) which is subordinate or junior in right of payment to the Securities or a Subsidiary Guaranty of such Person, as the case may be, pursuant to a written agreement to that effect.

          “Subsidiary” means, with respect to any Person, any corporation, association, partnership or other business entity of which more than 50% of the total voting power of shares of Voting Stock is at the time owned or controlled, directly or indirectly, by (1) such Person, (2) such Person and one or more Subsidiaries of such Person or (3) one or more Subsidiaries of such Person.

          “Subsidiary Guarantor” means each Subsidiary of the Company that executes this Indenture as a guarantor on the Issue Date and each other Subsidiary of the Company that thereafter guarantees the Securities pursuant to the terms of this Indenture.

          “Subsidiary Guaranty” means a Guarantee by a Subsidiary Guarantor of the Company’s obligations under this Indenture and with respect to the Securities.

          “Synthetic Lease” means, as to any Person, any lease (including leases that may be terminated by the lessee at any time) of any property (whether real, personal or mixed) (a) that is accounted for as an operating lease under GAAP and (b) in respect of which the lessee retains or obtains ownership of the property so leased for U.S. federal income tax purposes, other than any such lease under which such Person is the lessor.

          “Synthetic Lease Obligations” shall mean, as to any Person, an amount equal to the capitalized amount of the remaining lease payments under any Synthetic Lease that would appear on a balance sheet of such person in accordance with GAAP if such obligations were accounted for as Capital Lease Obligations.

24

          “Temporary Cash Investments” means any of the following:

     (1) any investment in direct obligations of the United States of America or any agency thereof or obligations guaranteed by the United States of America or any agency thereof;

     (2) investments in demand and time deposit accounts, certificates of deposit and money market deposits maturing within 180 days of the date of acquisition thereof issued by a bank or trust company which is organized under the laws of the United States of America, any State thereof or any foreign country recognized by the United States of America, and which bank or trust company has capital, surplus and undivided profits aggregating in excess of $50,000,000 (or the foreign currency equivalent thereof) and has outstanding debt which is rated “A” (or such similar equivalent rating) or higher by at least one nationally recognized statistical rating organization (as defined in Rule 436 under the Securities Act) or any money-market fund sponsored by a registered broker dealer or mutual fund distributor;

     (3) repurchase obligations with a term of not more than 30 days for underlying securities of the types described in clause (1) above entered into with a bank meeting the qualifications described in clause (2) above;

     (4) investments in commercial paper, maturing not more than 90 days after the date of acquisition, issued by a corporation (other than an Affiliate of the Company) organized and in existence under the laws of the United States of America or any foreign country recognized by the United States of America with a rating at the time as of which any investment therein is made of “P-1” (or higher) according to Moody’s or “A-1” (or higher) according to Standard and Poor’s;

     (5) investments in securities with maturities of six months or less from the date of acquisition issued or fully guaranteed by any state, commonwealth or territory of the United States of America, or by any political subdivision or taxing authority thereof, and rated at least “A” by Standard & Poor’s or “A” by Moody’s; and

     (6) investments in money market funds that invest substantially all their assets in securities of the types described in clauses (1) through (5) above.

          “Term B Senior Credit Facility” means the Credit Agreement, dated as of August 4, 2004, by and among, the Company, the Subsidiaries of the Company identified therein as guarantors, the lenders from time to time party thereto, and Credit Suisse, as Administrative Agent and collateral agent, together with the related documents thereto (including the term loans and revolving loans thereunder, and any letters of credit and reimbursement obligations related thereto, any guarantees and security documents), as amended, extended, renewed, restated, refunded, replaced, refinanced, supplemented, modified or otherwise changed (in whole or in part, and without limitation as to amount

25

(including incremental term loans), terms, conditions, covenants and other provisions) from time to time, and any one or more other agreements (and related documents) governing Indebtedness, including indentures, incurred to Refinance, substitute, supplement or add to (including increasing the amount available for borrowing or adding or removing any Person as a borrower or guarantor thereunder), in whole or in part, the borrowings and commitments then outstanding or permitted to be outstanding under such Credit Agreement or one or more successors to such Credit Agreement or one or more new credit agreements or other agreements.

          “TIA” means the Trust Indenture Act of 1939 (15 U.S.C. §§ 77aaa-77bbbb) as in effect on the date of this Indenture.

          “Total Assets” means the total assets of the Company and its Restricted Subsidiaries, determined on a consolidated basis in accordance with GAAP, as shown on the most recent balance sheet of the Company.

          “Trustee” means the party named as such in this Indenture until a successor replaces it and, thereafter, means the successor.

          “Trust Officer” means the Chairman of the Board, the President or any other officer or assistant officer of the Trustee assigned by the Trustee to administer its corporate trust matters.

          “Uniform Commercial Code” means the New York Uniform Commercial Code as in effect from time to time.

          “Unrestricted Subsidiary” means:

     (1) any Subsidiary of the Company that at the time of determination shall be designated an Unrestricted Subsidiary by the Board of Directors of the Company in the manner provided below; and

     (2) any Subsidiary of an Unrestricted Subsidiary.

The Board of Directors of the Company may designate any Subsidiary of the Company (including any newly acquired or newly formed Subsidiary) to be an Unrestricted Subsidiary unless such Subsidiary or any of its Subsidiaries owns any Capital Stock or Indebtedness of, or holds any Lien on any property of, the Company or any other Subsidiary of the Company that is not a Subsidiary of the Subsidiary to be so designated; provided, however, that either (A) the Subsidiary to be so designated has total assets of $1,000 or less or (B) if such Subsidiary has assets greater than $1,000, such designation would be permitted under Section 4.04. The Board of Directors of the Company may designate any Unrestricted Subsidiary to be a Restricted Subsidiary; provided, however, that immediately after giving effect to such designation (A) the Company could Incur $1.00 of additional Indebtedness under Section 4.03(a) and (B) no Default shall have occurred and be continuing. Any such designation by the Board of Directors of the Company shall be evidenced to the Trustee by promptly filing with the Trustee a copy of the resolution of the Board of Directors of the Company giving effect to such designation

26

and an Officers’ Certificate certifying that such designation complied with the foregoing provisions.

          “U.S. Dollar Equivalent” means with respect to any monetary amount in a currency other than U.S. dollars, at any time for determination thereof, the amount of U.S. dollars obtained by converting such foreign currency involved in such computation into U.S. dollars at the spot rate for the purchase of U.S. dollars with the applicable foreign currency as published in The Wall Street Journal in the “Exchange Rates” column under the heading “Currency Trading” on the date two Business Days prior to such determination.

          Except as described in Section 4.03, whenever it is necessary to determine whether the Company has complied with any covenant in this Indenture or a Default has occurred and an amount is expressed in a currency other than U.S. dollars, such amount will be treated as the U.S. Dollar Equivalent determined as of the date such amount is initially determined in such currency.

          “U.S. Government Obligations” means direct obligations (or certificates representing an ownership interest in such obligations) of the United States of America (including any agency or instrumentality thereof) for the payment of which the full faith and credit of the United States of America is pledged and which are not callable at the issuer’s option.

          “Voting Stock” of a Person means all classes of Capital Stock of such Person then outstanding and normally entitled (without regard to the occurrence of any contingency) to vote in the election of directors, managers or trustees thereof.

          “Wholly Owned Subsidiary” means a Restricted Subsidiary all the Capital Stock of which (other than directors’ qualifying shares) is owned by the Company or one or more other Wholly Owned Subsidiaries.

27

          SECTION 1.02. Other Definitions.

	Defined in
Term	Section
“Affiliate Transaction”		4.07	(a)
“Bankruptcy Law”		6.01
“Change of Control Offer”		4.09	(b)
“covenant defeasance option”		8.01	(b)
“Custodian”		6.01
“Event of Default”		6.01
“Guaranteed Obligations”		10.01
“Initial Lien”		4.10
“legal defeasance option”		8.01	(b)
“Offer”		4.06	(b)
“Offer Amount”		4.06	(c)(2)
“Offer Period”		4.06	(c)(2)
“Paying Agent”		2.03
“Purchase Date”		4.06	(c)(1)
“Registrar”		2.03
“Successor Company”		5.01	(a)(1)

          SECTION 1.03. Incorporation by Reference of Trust Indenture Act. This Indenture is subject to the mandatory provisions of the TIA which are incorporated by reference in and made a part of this Indenture. The following TIA terms have the following meanings:

          “Commission” means the SEC;

          “indenture securities” means the Securities and the Subsidiary Guaranties;

          “indenture security holder” means a Securityholder;

          “indenture to be qualified” means this Indenture;

          “indenture trustee” or “institutional trustee” means the Trustee; and

          “obligor” on the indenture securities means the Company, each Subsidiary Guarantor and any other obligor on the indenture securities.

          All other TIA terms used in this Indenture that are defined by the TIA, defined by TIA reference to another statute or defined by SEC rule have the meanings assigned to them by such definitions.

          SECTION 1.04. Rules of Construction. Unless the context otherwise requires:

     (1) a term has the meaning assigned to it;

28

     (2) an accounting term not otherwise defined has the meaning assigned to it in accordance with GAAP;

     (3) “or” is not exclusive;

     (4) “including” means including without limitation;

     (5) words in the singular include the plural and words in the plural include the singular;

     (6) unsecured Indebtedness shall not be deemed to be subordinate or junior to secured Indebtedness merely by virtue of its nature as unsecured Indebtedness;

     (7) secured Indebtedness shall not be deemed to be subordinate or junior to any other secured Indebtedness merely because it has a junior priority with respect to the same collateral;

     (8) the principal amount of any noninterest bearing or other discount security at any date shall be the principal amount thereof that would be shown on a balance sheet of the issuer dated such date prepared in accordance with GAAP;

     (9) the principal amount of any Preferred Stock shall be (A) the maximum liquidation value of such Preferred Stock or (B) the maximum mandatory redemption or mandatory repurchase price with respect to such Preferred Stock, whichever is greater; and

     (10) all references to the date the Securities were originally issued shall refer to the Issue Date.

Article 2

The Securities

          SECTION 2.01. Form and Dating. Provisions relating to the Initial Securities, the Private Exchange Securities and the Exchange Securities are set forth in the Rule 144A/Regulation S/IAI Appendix attached hereto (the “Appendix”) which is hereby incorporated in, and expressly made part of, this Indenture. The Initial Securities and the Trustee’s certificate of authentication shall be substantially in the form of Exhibit 1 to the Appendix which is hereby incorporated in, and expressly made a part of, this Indenture. The Exchange Securities, the Private Exchange Securities and the Trustee’s certificate of authentication shall be substantially in the form of Exhibit A, which is hereby incorporated in and expressly made a part of this Indenture. The Securities may have notations, legends or endorsements required by law, stock exchange rule, agreements to which the Company is subject, if any, or usage (provided that any such notation, legend or endorsement is in a form acceptable to the Company). Each Security shall be dated the date of its authentication. The terms of the Securities set forth in the Appendix and Exhibit A are part of the terms of this Indenture.

29

          SECTION 2.02. Execution and Authentication. At least one Officer shall sign the Securities for the Company by manual or facsimile signature.

          If an Officer whose signature is on a Security no longer holds that office at the time the Trustee authenticates the Security, the Security shall be valid nevertheless.

          A Security shall not be valid until an authorized signatory of the Trustee manually signs the certificate of authentication on the Security. The signature shall be conclusive evidence that the Security has been authenticated under this Indenture.

          On the Issue Date, the Trustee shall authenticate and deliver $250,000,000 of 10¹/4% Senior Notes due 2015 and, at any time and from time to time thereafter, the Trustee shall authenticate and deliver Securities for original issue in an aggregate principal amount specified in such order, in each case upon a written order of the Company signed by at least one Officer. Such order shall specify the amount of the Securities to be authenticated and the date on which the original issue of Securities is to be authenticated and, in the case of an issuance of Additional Securities pursuant to Section 2.13 after the Issue Date, shall certify that such issuance is in compliance with Section 4.03.

          The Trustee may appoint an authenticating agent reasonably acceptable to the Company to authenticate the Securities. Unless limited by the terms of such appointment, an authenticating agent may authenticate Securities whenever the Trustee may do so. Each reference in this Indenture to authentication by the Trustee includes authentication by such agent. An authenticating agent has the same rights as any Registrar, Paying Agent or agent for service of notices and demands.

          SECTION 2.03. Registrar and Paying Agent. The Company shall maintain an office or agency where Securities may be presented for registration of transfer or for exchange (the “Registrar”) and an office or agency where Securities may be presented for payment (the “Paying Agent”). The Registrar shall keep a register of the Securities and of their transfer and exchange. The Company may have one or more co-registrars and one or more additional paying agents. The term “Paying Agent” includes any additional paying agent.

          The Company shall enter into an appropriate agency agreement with any Registrar, Paying Agent or co-registrar not a party to this Indenture, which shall incorporate the terms of the TIA. The agreement shall implement the provisions of this Indenture that relate to such agent. The Company shall notify the Trustee of the name and address of any such agent. If the Company fails to maintain a Registrar or Paying Agent, the Trustee shall act as such and shall be entitled to appropriate compensation therefor pursuant to Section 7.07. The Company or any Wholly Owned Subsidiary incorporated or organized within the United States of America may act as Paying Agent, Registrar, co-registrar or transfer agent.

          The Company initially appoints the Trustee as Registrar and Paying Agent in connection with the Securities.

30

          SECTION 2.04. Paying Agent To Hold Money in Trust. Prior to each due date of the principal and interest on any Security, the Company shall deposit with the Paying Agent a sum sufficient to pay such principal and interest when so becoming due. The Company shall require each Paying Agent (other than the Trustee) to agree in writing that the Paying Agent shall hold in trust for the benefit of Securityholders or the Trustee all money held by the Paying Agent for the payment of principal of or interest on the Securities and shall notify the Trustee of any default by the Company in making any such payment. If the Company or a Subsidiary acts as Paying Agent, it shall segregate the money held by it as Paying Agent and hold it as a separate trust fund. The Company at any time may require a Paying Agent to pay all money held by it to the Trustee and to account for any funds disbursed by the Paying Agent. Upon complying with this Section, the Paying Agent shall have no further liability for the money delivered to the Trustee.

          SECTION 2.05. Securityholder Lists. The Trustee shall preserve in as current a form as is reasonably practicable the most recent list available to it of the names and addresses of Securityholders. If the Trustee is not the Registrar, the Company shall furnish to the Trustee, in writing at least five Business Days before each interest payment date and at such other times as the Trustee may request in writing, a list in such form and as of such date as the Trustee may reasonably require of the names and addresses of Securityholders and the Company shall otherwise comply with TIA § 312(a).

          SECTION 2.06. Transfer and Exchange. The Securities shall be issued in registered form and shall be transferable only upon the surrender of a Security for registration of transfer. When a Security is presented to the Registrar or a co-registrar with a request to register a transfer, the Registrar shall register the transfer as requested if the requirements of this Indenture and Section 8-401(a) of the Uniform Commercial Code are met. When Securities are presented to the Registrar or a co-registrar with a request to exchange them for an equal principal amount of Securities of other denominations, the Registrar shall make the exchange as requested if the same requirements are met.

          SECTION 2.07. Replacement Securities. If a mutilated Security is surrendered to the Registrar or if the Holder of a Security claims that the Security has been lost, destroyed or wrongfully taken, the Company shall issue and the Trustee shall authenticate a replacement Security if the requirements of Section 8-405 of the Uniform Commercial Code are met and the Holder satisfies any other reasonable requirements of the Trustee. If required by the Trustee or the Company, such Holder shall furnish an indemnity bond sufficient in the judgment of the Company and the Trustee to protect the Company, the Trustee, the Paying Agent, the Registrar and any co-registrar from any loss which any of them may suffer if a Security is replaced. The Company and the Trustee may charge the Holder for their expenses in replacing a Security.

          Every replacement Security is an additional Obligation of the Company.

          SECTION 2.08. Outstanding Securities. Securities outstanding at any time are all Securities authenticated by the Trustee except for those canceled by it,

31

those delivered to it for cancellation and those described in this Section as not outstanding. A Security does not cease to be outstanding because the Company or an Affiliate of the Company holds the Security.

          If a Security is replaced pursuant to Section 2.07, it ceases to be outstanding unless the Trustee and the Company receive proof satisfactory to them that the replaced Security is held by a protected purchaser (as defined in Section 8-303 of the Uniform Commercial Code).

          If the Paying Agent segregates and holds in trust, in accordance with this Indenture, on a redemption date or maturity date money sufficient to pay all principal and interest payable on that date with respect to the Securities (or portions thereof) to be redeemed or maturing, as the case may be, then on and after that date such Securities (or portions thereof) cease to be outstanding and interest on them ceases to accrue.

          SECTION 2.09. Temporary Securities. Until definitive Securities are ready for delivery, the Company may prepare and the Trustee shall authenticate temporary Securities. Temporary Securities shall be substantially in the form of definitive Securities but may have variations that the Company considers appropriate for temporary Securities. Without unreasonable delay, the Company shall prepare and the Trustee shall authenticate definitive Securities and deliver them in exchange for temporary Securities.

          SECTION 2.10. Cancellation. The Company at any time may deliver Securities to the Trustee for cancellation. The Registrar and the Paying Agent shall forward to the Trustee any Securities surrendered to them for registration of transfer, exchange or payment. The Trustee and no one else shall cancel and destroy (subject to the record retention requirements of the Exchange Act) all Securities surrendered for registration of transfer, exchange, payment or cancellation and deliver a certificate of such destruction to the Company unless the Company directs the Trustee to deliver canceled Securities to the Company. The Company may not issue new Securities to replace Securities it has redeemed, paid or delivered to the Trustee for cancellation.

          SECTION 2.11. Defaulted Interest. If the Company defaults in a payment of interest on the Securities, the Company shall pay defaulted interest (plus interest on such defaulted interest to the extent lawful) in any lawful manner. The Company may pay the defaulted interest to the persons who are Securityholders on a subsequent special record date. The Company shall fix or cause to be fixed any such special record date and payment date to the reasonable satisfaction of the Trustee and shall promptly mail to each Securityholder a notice that states the special record date, the payment date and the amount of defaulted interest to be paid.

          SECTION 2.12. CUSIP Numbers, ISINs, etc. The Company in issuing the Securities may use “CUSIP” numbers, ISINs and “Common Code” numbers (in each case if then generally in use) and, if so, the Trustee shall use “CUSIP” numbers, ISINs and “Common Code” numbers in notices of redemption as a convenience to Holders; provided, however, that any such notice may state that no representation is made

32

as to the correctness of such numbers either as printed on the Securities or as contained in any notice of a redemption and that reliance may be placed only on the other identification numbers printed on the Securities, and any such redemption shall not be affected by any defect in or omission of such numbers. The Company shall advise the Trustee in writing of any change in any “CUSIP” numbers, ISINs or “Common Code” numbers applicable to the Securities.

          SECTION 2.13. Issuance of Additional Securities. After the Issue Date, the Company shall be entitled, subject to its compliance with Section 4.03, to issue Additional Securities under this Indenture, which Securities shall have identical terms as the Initial Securities issued on the Issue Date, other than with respect to the date of issuance and issue price. All the Securities issued under this Indenture shall be treated as a single class for all purposes of this Indenture including waivers, amendments, redemptions and offers to purchase.

          With respect to any Additional Securities, the Company shall set forth in a resolution of the Board of Directors and an Officers’ Certificate, a copy of each which shall be delivered to the Trustee, the following information:

     (1) the aggregate principal amount of such Additional Securities to be authenticated and delivered pursuant to this Indenture and the provision of Section 4.03 that the Company is relying on to issue such Additional Securities;

     (2) the issue price, the issue date and the CUSIP number of such Additional Securities; provided, however, that no Additional Securities may be issued at a price that would cause such Additional Securities to have “original issue discount” within the meaning of Section 1273 of the Code; and

     (3) whether such Additional Securities shall be Initial Securities or shall be issued in the form of Exchange Securities as set forth in Exhibit A.

Article 3

Redemption

          SECTION 3.01. Notices to Trustee. If the Company elects to redeem Securities pursuant to paragraph 5 of the Securities, it shall notify the Trustee in writing of the redemption date, the principal amount of Securities to be redeemed.

          The Company shall give each notice to the Trustee provided for in this Section at least 60 days before the redemption date unless the Trustee consents to a shorter period. Such notice shall be accompanied by an Officers’ Certificate and an Opinion of Counsel from the Company to the effect that such redemption will comply with the conditions herein.

          SECTION 3.02. Selection of Securities to Be Redeemed. If fewer than all the Securities are to be redeemed, the Trustee shall select the Securities to be redeemed on a pro rata basis to the extent practicable, unless the Securities are listed on

33

any national securities exchange, in which case the Trustee shall select Securities for redemption in accordance with the rules and requirements of such exchange. The Trustee shall make the selection from outstanding Securities not previously called for redemption. The Trustee may select for redemption portions of the principal of Securities that have denominations larger than $2,000. Securities and portions of them the Trustee selects shall be in principal amounts of $2,000 or a whole multiple of $1,000 in excess of $2,000. Provisions of this Indenture that apply to Securities called for redemption also apply to portions of Securities called for redemption. The Trustee shall notify the Company promptly of the Securities or portions of Securities to be redeemed.

          SECTION 3.03. Notice of Redemption. At least 30 days but not more than 60 days before a date for redemption of Securities, the Company shall mail a notice of redemption by first-class mail to each Holder of Securities to be redeemed at such Holder’s registered address.

          The notice shall identify the Securities to be redeemed and shall state:

     (1) the redemption date;

     (2) the redemption price;

     (3) the name and address of the Paying Agent;

     (4) that Securities called for redemption must be surrendered to the Paying Agent to collect the redemption price;

     (5) if fewer than all the outstanding Securities are to be redeemed, the identification and principal amounts of the particular Securities to be redeemed;

     (6) that, unless the Company defaults in making such redemption payment, interest on Securities (or portion thereof) called for redemption ceases to accrue on and after the redemption date;

     (7) the “CUSIP” number, ISIN or “Common Code” number, if any, printed on the Securities being redeemed; and

     (8) that no representation is made as to the correctness or accuracy of the “CUSIP” number, ISIN, or “Common Code” number, if any, listed in such notice or printed on the Securities.

          At the Company’s request, the Trustee shall give the notice of redemption in the Company’s name and at the Company’s expense. In such event, the Company shall provide the Trustee with the information required by this Section.

          SECTION 3.04. Effect of Notice of Redemption. Once notice of redemption is mailed, Securities called for redemption become due and payable on the redemption date and at the redemption price stated in the notice. Upon surrender to the Paying Agent, such Securities shall be paid at the redemption price stated in the notice,

34

plus accrued interest to the redemption date (subject to the right of Holders of record on the relevant record date to receive interest due on the related interest payment date), and such Securities shall be canceled by the Trustee. Failure to give notice or any defect in the notice to any Holder shall not affect the validity of the notice to any other Holder.

          SECTION 3.05. Deposit of Redemption Price. Prior to the redemption date, the Company shall deposit with the Paying Agent (or, if the Company or a Subsidiary is the Paying Agent, shall segregate and hold in trust) money sufficient to pay the redemption price of and accrued interest on all Securities to be redeemed on that date other than Securities or portions of Securities called for redemption which have been delivered by the Company to the Trustee for cancellation.

          SECTION 3.06. Securities Redeemed in Part. Upon surrender of a Security that is redeemed in part, the Company shall execute and the Trustee shall authenticate for the Holder (at the Company’s expense) a new Security equal in principal amount to the unredeemed portion of the Security surrendered.

Article 4

Covenants

          SECTION 4.01. Payment of Securities. The Company shall promptly pay the principal of and interest on the Securities on the dates and in the manner provided in the Securities and in this Indenture. Principal and interest shall be considered paid on the date due if on such date the Trustee or the Paying Agent holds in accordance with this Indenture money sufficient to pay all principal and interest then due.

          The Company shall pay interest on overdue principal at the rate specified therefor in the Securities, and it shall pay interest on overdue installments of interest at the same rate to the extent lawful.

          SECTION 4.02. SEC Reports. Notwithstanding that the Company may not be subject to the reporting requirements of Section 13 or 15(d) of the Exchange Act, the Company shall file with the SEC (to the extent the SEC will accept such filings) and provide the Trustee and Securityholders with such annual and other reports as are specified in Sections 13 and 15(d) of the Exchange Act and applicable to a U.S. corporation subject to such Sections, such reports to be so filed and provided at the times specified for the filings of such reports under such Sections and containing all the information, audit reports and exhibits required for such reports. If the SEC will not accept such filings for any reason, the Company shall post the reports specified in the preceding sentence on its website within the time periods that would apply if the Company were required to file those reports with the SEC.

          At any time that any of the Company’s Subsidiaries are Unrestricted Subsidiaries, then the quarterly and annual financial information required by the preceding paragraph shall include a reasonably detailed presentation, either on the face of the financial statements or in the footnotes thereto, and in “Management’s Discussion and

35

Analysis of Financial Condition and Results of Operations,” of the financial condition and results of operations of the Company and its Restricted Subsidiaries separate from the financial condition and results of operations of the Unrestricted Subsidiaries of the Company.

          In addition, the Company shall furnish to the Holder of the Securities and to prospective investors, upon the requests of such Holders, any information required to be delivered pursuant to Rule 144A(d)(4) under the Securities Act so long as the Securities are not freely transferable under the Securities Act. The Company also shall comply with the other provisions of TIA § 314(a).

          SECTION 4.03. Limitation on Indebtedness. (a) The Company shall not, and shall not permit any Restricted Subsidiary to, Incur, directly or indirectly, any Indebtedness; provided, however, that the Company and the Subsidiary Guarantors shall be entitled to Incur Indebtedness if, on the date of such Incurrence and after giving effect thereto on a pro forma basis the Consolidated Coverage Ratio exceeds 2.0 to 1.0.

          (b) Notwithstanding Section 4.03(a), the Company and the Restricted Subsidiaries shall be entitled to Incur any or all of the following Indebtedness:

     (1) Indebtedness Incurred by the Company pursuant to the Term B Senior Credit Facility; provided, however, that, immediately after giving effect to any such Incurrence, the aggregate principal amount of all Indebtedness Incurred under this clause (1) and then outstanding does not exceed $360,000,000 less the sum of all principal payments with respect to such Indebtedness pursuant to Section 4.06(a)(3)(A);

     (2) Indebtedness owed to and held by the Company or a Restricted Subsidiary; provided, however, that (A) any subsequent issuance or transfer of any Capital Stock which results in any such Restricted Subsidiary ceasing to be a Restricted Subsidiary or any subsequent transfer of such Indebtedness (other than to the Company or a Restricted Subsidiary) shall be deemed, in each case, to constitute the Incurrence of such Indebtedness by the obligor thereon, (B) if the Company is the obligor on such Indebtedness, such Indebtedness is expressly subordinated to the prior payment in full in cash of all obligations with respect to the Securities, and (C) if a Subsidiary Guarantor is the obligor on such Indebtedness, such Indebtedness is expressly subordinated to the prior payment in full in cash of all obligations of such Subsidiary Guarantor with respect to its Subsidiary Guaranty;

     (3) the Securities and the Exchange Securities (but excluding any Additional Securities);

     (4) Indebtedness outstanding on the Issue Date (other than Indebtedness described in clause (1), (2) or (3) of this Section 4.03(b), but including the Junior Subordinated Notes and the Junior Warrants);

36

     (5) Indebtedness of a Restricted Subsidiary Incurred and outstanding on or prior to the date on which such Subsidiary was acquired by the Company (other than Indebtedness Incurred in connection with, or to provide all or any portion of the funds or credit support utilized to consummate, the transaction or series of related transactions pursuant to which such Subsidiary became a Subsidiary or was acquired by the Company); provided, however, that on the date of such acquisition and after giving pro forma effect thereto, the Company would have been entitled to Incur at least $1.00 of additional Indebtedness pursuant to Section 4.03(a);

     (6) Refinancing Indebtedness in respect of Indebtedness Incurred pursuant to Section 4.03(a) or pursuant to clause (3), (4) or (5) of this Section 4.03(b) or this clause (6); provided, however, that to the extent such Refinancing Indebtedness directly or indirectly Refinances Indebtedness of a Subsidiary Incurred pursuant to clause (5), such Refinancing Indebtedness shall be Incurred only by such Subsidiary;

     (7) Hedging Obligations consisting of Interest Rate Agreements (and renewals thereof) directly related to Indebtedness permitted to be Incurred by the Company and its Restricted Subsidiaries pursuant to this Indenture;

     (8) obligations in respect of performance, bid, appeal and surety bonds and completion guarantees provided by the Company or any Restricted Subsidiary in the ordinary course of business;

     (9) Indebtedness arising from the honoring by a bank or other financial institution of a check, draft or similar instrument drawn against insufficient funds in the ordinary course of business; provided, however, that such Indebtedness is extinguished within two Business Days of its Incurrence;

     (10) Indebtedness consisting of the Subsidiary Guaranty of a Subsidiary Guarantor and any Guarantee by a Subsidiary Guarantor of Indebtedness Incurred pursuant to Section 4.03(a) or pursuant to clause (1), (2), (3) or (4) of this Section 4.03(b) or pursuant to clause (6) of this Section 4.03(b) to the extent the Refinancing Indebtedness Incurred thereunder directly or indirectly Refinances Indebtedness Incurred pursuant to Section 4.03(a) or pursuant to clause (3) or (4) of this Section 4.03(b);

     (11) Indebtedness of any Foreign Subsidiary to the extent Incurred for working capital purposes;

     (12) Indebtedness of the Company or any Subsidiary Guarantor incurred to finance the acquisition, construction or improvement of any fixed or capital assets, and extensions, renewals and replacements of any such Indebtedness that do not increase the outstanding principal amount thereof; provided that (a) such Indebtedness is Incurred prior to or within 90 days after such acquisition or the completion of such construction or improvement and (b)

37

the aggregate principal amount of Indebtedness outstanding at any time pursuant to this clause (12), when taken together with the aggregate principal amount of all Capital Lease Obligations and Synthetic Lease Obligations outstanding at such time pursuant to the immediately succeeding clause (13), shall not exceed the greater of $25,000,000 and 2.5% of Total Assets;

     (13) Capital Lease Obligations and Synthetic Lease Obligations; provided that the aggregate amount of all Capital Lease Obligations and Synthetic Lease Obligations outstanding at any time pursuant to this clause (13), when taken together with the aggregate principal amount of Indebtedness outstanding at such time pursuant to the immediately preceding clause (12), shall not exceed the greater of $25,000,000 and 2.5% of Total Assets;

     (14) Permitted Subordinated Indebtedness of the Company or any Restricted Subsidiary Incurred to (a) finance a Permitted ESOP Transaction, (b) finance a Permitted Acquisition or (c) refinance existing Indebtedness of a Person that becomes a wholly owned Subsidiary of the Company as a result of a Permitted Acquisition (so long as such Indebtedness is not Incurred in contemplation of the applicable Permitted Acquisition); provided that the aggregate amount of all Permitted Indebtedness outstanding at any time pursuant to this clause (14) shall not exceed $35,000,000;

     (15) Indebtedness of the Company or any Restricted Subsidiary constituting reimbursement obligations with respect to letters of credit issued in the ordinary course of business, including letters of credit in respect of workers’ compensation claims, or other Indebtedness with respect to reimbursement type obligations regarding workers’ compensation claims; provided that upon the drawing of such letters of credit or the Incurrence of such Indebtedness, such obligations are reimbursed within 30 days following such drawing or Incurrence;

     (16) Indebtedness arising from the honoring by a bank or other financial institution of a check, draft or similar instrument inadvertently drawn against insufficient funds in the ordinary course of business, so long as such Indebtedness is extinguished within 30 days of the applicable Incurrence;

     (17) Indebtedness arising from agreements of the Company or any Restricted Subsidiary providing for indemnification, adjustment of purchase price, earn-outs, or similar obligations, in each case, incurred or assumed in connection with any business acquisition or any disposition of any business, assets or Subsidiary other than guarantees of Indebtedness incurred by any Person acquiring all or any portion of such business, assets or Subsidiary for the purpose of financing such acquisition; provided that (a) the total amount of such Indebtedness which may be Incurred with respect to any such transaction shall not exceed the gross proceeds including non-cash proceeds actually received by the Company or any Restricted Subsidiary in connection therewith and (b) such Indebtedness is not reflected on the balance sheet of the Company or any Restricted Subsidiary under GAAP;

38

     (18) Indebtedness constituting obligations of the Company or any Restricted Subsidiary under deferred compensation agreements entered into in the ordinary course; provided that such obligations are satisfied within 30 days of becoming due; and

     (19) Indebtedness of the Company or any Restricted Subsidiary, including Additional Securities, in an aggregate principal amount which, when taken together with all other Indebtedness of the Company and its Restricted Subsidiaries outstanding on the date of such Incurrence (other than Indebtedness permitted by clauses (1) through (18) of this Section 4.03(b) or Section 4.03(a)) does not exceed $35,000,000.

          (c) Notwithstanding the foregoing, neither the Company nor any Subsidiary Guarantor shall incur any Indebtedness pursuant to Section 4.03(b) if the proceeds thereof are used, directly or indirectly, to Refinance any Subordinated Obligations of the Company or any Subsidiary Guarantor unless such Indebtedness shall be subordinated to the Securities or the applicable Subsidiary Guaranty to at least the same extent as such Subordinated Obligations.

          (d) For purposes of determining compliance with this Section 4.03:

     (1) any Indebtedness remaining outstanding under the Term B Senior Credit Facility after the application of the net proceeds from the sale of the Securities shall be treated as Incurred on the Issue Date under Section 4.03(b)(1);

     (2) in the event that an item of Indebtedness (or any portion thereof) meets the criteria of more than one of the types of Indebtedness described above, the Company, in its sole discretion, will classify such item of Indebtedness (or any portion thereof) at the time of Incurrence and will only be required to include the amount and type of such Indebtedness in one of the above clauses;

     (3) the Company shall be entitled to divide and classify an item of Indebtedness in more than one of the types of Indebtedness described above; and

     (4) any Indebtedness originally classified as Incurred pursuant to one of the clauses in Section 4.03(b) above (other than pursuant to Section 4.03(b)(1)) may later be reclassified by the Company such that it will be deemed as having been Incurred pursuant to Section 4.03(a) above or another clause in Section 4.03(b), as applicable, to the extent that such reclassified Indebtedness could be Incurred pursuant to such new clause at the time of such reclassification.

          (e) For purposes of determining compliance with any U.S. dollar denominated restriction on the Incurrence of Indebtedness where the Indebtedness Incurred is denominated in a different currency, the amount of such Indebtedness will be the U.S. Dollar Equivalent determined on the date of the Incurrence of such Indebtedness; provided, however, that if any such Indebtedness denominated in a different currency is subject to a Currency Agreement with respect to U.S. dollars covering all principal, premium, if any, and interest payable on such Indebtedness, the

39

amount of such Indebtedness expressed in U.S. dollars will be as provided in such Currency Agreement. The principal amount of any Refinancing Indebtedness Incurred in the same currency as the Indebtedness being Refinanced will be the U.S. Dollar Equivalent of the Indebtedness Refinanced, except to the extent that (1) such U.S. Dollar Equivalent was determined based on a Currency Agreement, in which case the Refinancing Indebtedness will be determined in accordance with the preceding sentence, and (2) the principal amount of the Refinancing Indebtedness exceeds the principal amount of the Indebtedness being Refinanced, in which case the U.S. Dollar Equivalent of such excess will be determined on the date such Refinancing Indebtedness is Incurred.

          SECTION 4.04. Limitation on Restricted Payments. (a) The Company shall not, and shall not permit any Restricted Subsidiary, directly or indirectly, to make a Restricted Payment if at the time the Company or such Restricted Subsidiary makes such Restricted Payment:

     (1) a Default shall have occurred and be continuing (or would result therefrom);

     (2) the Company is not entitled to Incur an additional $1.00 of Indebtedness under Section 4.03(a); or

     (3) the aggregate amount of such Restricted Payment and all other Restricted Payments since the Issue Date would exceed the sum of (without duplication):

     (A) 50% of the Consolidated Net Income accrued during the period (treated as one accounting period) from the beginning of the fiscal quarter immediately following the fiscal quarter during which the Issue Date occurs to the end of the most recent fiscal quarter ending at least 45 days prior to the date of such Restricted Payment (or, in case such Consolidated Net Income shall be a deficit, minus 100% of such deficit); plus

     (B) 100% of the aggregate Net Cash Proceeds received by the Company (x) from the issuance or sale of its Qualified Capital Stock subsequent to the Issue Date, (y) as a contribution in respect of the outstanding Qualified Capital Stock of the Company by its stockholders subsequent to the Issue Date and (z) from optional employee contributions to the ESOP; plus

     (C) the amount by which Indebtedness of the Company is reduced on the Company’s balance sheet upon the conversion or exchange subsequent to the Issue Date of any Indebtedness of the Company convertible or exchangeable for Capital Stock (other than Capital Stock that constitutes Disqualified Stock) of the Company (less the amount of any cash, or the fair value of any other property, distributed by the Company upon such conversion or exchange); provided, however, that the

40

foregoing amount shall not exceed the Net Cash Proceeds received by the Company or any Restricted Subsidiary from the sale of such Indebtedness (excluding Net Cash Proceeds from sales to a Subsidiary of the Company or to an employee stock ownership plan or to a trust established by the Company or any of its Subsidiaries for the benefit of their employees); plus

     (D) an amount equal to the sum of (i) the net reduction in the Investments (other than Permitted Investments) made by the Company or any Restricted Subsidiary in any Person resulting from repurchases, repayments or redemptions of such Investments by such Person, proceeds realized on the sale of such Investment and proceeds representing the return of capital (excluding dividends and distributions), in each case received by the Company or any Restricted Subsidiary, and (ii) to the extent such Person is an Unrestricted Subsidiary, the portion (proportionate to the Company’s equity interest in such Subsidiary) of the Fair Market Value of the net assets of such Unrestricted Subsidiary at the time such Unrestricted Subsidiary is designated a Restricted Subsidiary; provided, however, that the foregoing sum shall not exceed, in the case of any such Person or Unrestricted Subsidiary, the amount of Investments (excluding Permitted Investments) previously made (and treated as a Restricted Payment) by the Company or any Restricted Subsidiary in such Person or Unrestricted Subsidiary.

          (b) The provisions of Section 4.04(a) shall not prohibit:

     (1) any Restricted Payment made out of the Net Cash Proceeds of the substantially concurrent sale of, or made by exchange for, Qualified Capital Stock of the Company or a substantially concurrent cash capital contribution received by the Company from its shareholders; provided, however, that (A) such Restricted Payment shall be excluded in the calculation of the amount of Restricted Payments and (B) the Net Cash Proceeds from such sale or such cash capital contribution (to the extent so used for such Restricted Payment) shall be excluded from the calculation of amounts under Section 4.04(a)(3)(B);

     (2) any purchase, repurchase, redemption, defeasance or other acquisition or retirement for value of Subordinated Obligations of the Company or a Subsidiary Guarantor made by exchange for, or out of the proceeds of the substantially concurrent Incurrence of, Indebtedness of such Person which is permitted to be Incurred pursuant to Section 4.03; provided, however, that such purchase, repurchase, redemption, defeasance or other acquisition or retirement for value shall be excluded in the calculation of the amount of Restricted Payments;

     (3) dividends paid within 60 days after the date of declaration thereof if at such date of declaration such dividend would have complied with this Section 4.04; provided, however, that at the time of payment of such dividend, no

41

other Default shall have occurred and be continuing (or result therefrom); provided further, however, that such dividend shall be included in the calculation of the amount of Restricted Payments;

     (4) the declaration and payments of dividends on Disqualified Stock issued pursuant to Section 4.03; provided, however, that at the time of payment of such dividend, no Default shall have occurred and be continuing (or result therefrom); provided further, however, that such dividends shall be excluded in the calculation of the amount of Restricted Payments;

     (5) repurchases of Capital Stock deemed to occur upon exercise of stock options or warrants if such Capital Stock represents a portion of the exercise price of such options or warrants; provided, however, that such Restricted Payments shall be excluded in the calculation of the amount of Restricted Payments;

     (6) cash payments in lieu of the issuance of fractional shares in connection with the exercise of warrants, options or other securities convertible into or exchangeable for Capital Stock of the Company; provided, however, that any such cash payment shall not be for the purpose of evading the limitation of this Section 4.04 (as determined in good faith by the Board of Directors or the Compensation Committee thereof); provided further, however, that such payments shall be excluded in the calculation of the amount of Restricted Payments;

     (7) in the event of a Change of Control, and if no Default shall have occurred and be continuing, the payment, purchase, redemption, defeasance or other acquisition or retirement of Subordinated Obligations of the Company or any Subsidiary Guarantor, in each case, at a purchase price not greater than 101% of the principal amount of such Subordinated Obligations, plus any accrued and unpaid interest thereon; provided, however, that prior to such payment, purchase, redemption, defeasance or other acquisition or retirement, the Company (or a third party to the extent permitted by this Indenture) has made a Change of Control Offer with respect to the Securities as a result of such Change of Control and has repurchased all Securities validly tendered and not withdrawn in connection with such Change of Control Offer; provided further, however, that such payments, purchases, redemptions, defeasances or other acquisitions or retirements shall be included in the calculation of the amount of Restricted Payments;

     (8) payments of intercompany Subordinated Obligations, the Incurrence of which was permitted under Section 4.03(b)(2); provided, however, that no Default has occurred and is continuing or would otherwise result therefrom; provided further, however, that such payments shall be excluded in the calculation of the amount of Restricted Payments;

42

     (9) any purchase or redemption of Subordinated Obligations of the Company or a Subsidiary Guarantor from Net Available Cash to the extent permitted under Section 4.06 after the Company (or a Restricted Subsidiary, as the case may be) has made an offer to the Holders of the Securities to purchase the Securities pursuant to Section 4.06(a)(3)(C); provided, however, that such purchase or redemption shall be excluded in the calculation of the amount of Restricted Payments;

     (10) in the event of an Asset Disposition that requires the Company to offer to repurchase Securities pursuant to Section 4.06, and if no Default shall have occurred and be continuing, the payment, purchase, redemption, defeasance or other acquisition or retirement of Subordinated Obligations of the Company or any Subsidiary Guarantor, in each case, at a purchase price not greater than 100% of the principal amount (or, if such Subordinated Obligations were issued with original issue discount, 100% of the accreted value) of such Subordinated Obligations, plus any accrued and unpaid interest thereon; provided, however, that (A) prior to such payment, purchase, redemption, defeasance or other acquisition or retirement, the Company has made an offer with respect to the Securities pursuant to the provisions of Section 4.06 and has repurchased all Securities validly tendered and not withdrawn in connection with such offer and (B) the aggregate amount of all such payments, purchases, redemptions, defeasances or other acquisitions or retirements of all such Subordinated Obligations may not exceed (x) the amount by which Net Available Cash was reduced as a result of the offer with respect to the Securities less (y) the Net Available Cash actually used to consummate the offer of the Securities (and any other Senior Indebtedness included in such offer); provided further, however, that such Restricted Payments shall be included in the calculation of the amount of Restricted Payments;

     (11) the redemption or repurchase for value of any Capital Stock of the Company as a result of distributions by the ESOT of such Capital Stock to the Former JSC Participants pursuant to the ESOP Plan Documents as a result of their voluntary or involuntary termination of employment with the Company or any of its Subsidiaries during the JSC Termination Period; provided, however, that the aggregate amount of Restricted Payments made pursuant to this clause (11) shall not exceed $13,000,000;

     (12) Permitted ESOP Transactions or purchases, repurchases, redemptions, defeasances or other acquisitions or retirements for value of the Junior Subordinated Note or the Junior Warrants; provided, however, that the aggregate amount of Restricted Payments made pursuant to this clause (12) shall not exceed $25,000,000; or

     (13) Restricted Payments in an amount which, when taken together with all Restricted Payments made pursuant to this clause (13), does not exceed $30,000,000; provided, however, that (A) at the time of each such Restricted Payment, no Default shall have occurred and be continuing (or result therefrom)

43

and (B) the amount of Restricted Payments made pursuant to this clause (13) shall be included in the calculation of the amount of Restricted Payments.

          SECTION 4.05. Limitation on Restrictions on Distributions from Restricted Subsidiaries. The Company shall not, and shall not permit any Restricted Subsidiary to, create or otherwise cause or permit to exist or become effective any consensual encumbrance or restriction on the ability of any Restricted Subsidiary to (a) pay dividends or make any other distributions on its Capital Stock to the Company or a Restricted Subsidiary or pay any Indebtedness owed to the Company or a Subsidiary Guarantor, (b) make any loans or advances to the Company or a Subsidiary Guarantor or (c) transfer any of its property or assets to the Company or a Subsidiary Guarantor, except:

     (1) with respect to clauses (a), (b) and (c),

     (A) any encumbrance or restriction pursuant to an agreement in effect at or entered into on the Issue Date, including the Term B Senior Credit Facility in effect on the Issue Date;

     (B) any encumbrance or restriction with respect to a Restricted Subsidiary pursuant to an agreement relating to any Indebtedness Incurred by such Restricted Subsidiary on or prior to the date on which such Restricted Subsidiary was acquired by the Company (other than Indebtedness Incurred as consideration in, or to provide all or any portion of the funds or credit support utilized to consummate, the transaction or series of related transactions pursuant to which such Restricted Subsidiary became a Restricted Subsidiary or was acquired by the Company) and outstanding on such date;

     (C) any encumbrance or restriction pursuant to an agreement effecting a Refinancing of Indebtedness Incurred pursuant to an agreement referred to in Section 4.05(1)(A) or (B) or this clause (C) or contained in any amendment to an agreement referred to in Section 4.05(1)(A) or (B) or this clause (C); provided, however, that the encumbrances and restrictions with respect to such Restricted Subsidiary contained in any such refinancing agreement or amendment are no less favorable to the Securityholders than encumbrances and restrictions with respect to such Restricted Subsidiary contained in such predecessor agreements;

     (D) any encumbrance or restriction with respect to a Restricted Subsidiary imposed pursuant to an agreement entered into for the sale or disposition of all or substantially all the Capital Stock or assets of such Restricted Subsidiary pending the closing of such sale or disposition;

     (E) any encumbrance or restriction pursuant to applicable law, rule, regulation or order;

44

     (F) restrictions on cash, cash equivalents, Temporary Cash Investments or other deposits or net worth imposed under contracts entered into in the ordinary course of business, including such restrictions imposed by customers or insurance, surety or bonding companies;

     (G) any encumbrance or restriction with respect to a Foreign Subsidiary entered into the ordinary course of business or pursuant to the terms of Indebtedness that was Incurred by such Foreign Subsidiary in compliance with the terms of this Indenture;

     (H) provisions contained in any license, permit or other accreditation with a regulatory authority entered into the ordinary course of business;

     (I) provisions in agreements or instruments which prohibit the payment or making of dividends or other distributions other than on a pro rata basis; and

     (2) with respect to clause (c) only,

     (A) any encumbrance or restriction consisting of customary nonassignment provisions in leases governing leasehold interests to the extent such provisions restrict the transfer of the lease or the property leased thereunder; and

     (B) any encumbrance or restriction contained in security agreements or mortgages securing Indebtedness of a Restricted Subsidiary to the extent such encumbrance or restriction restricts the transfer of the property subject to such security agreements or mortgages.

          SECTION 4.06. Limitation on Sales of Assets and Subsidiary Stock. (a) The Company shall not, and shall not permit any Restricted Subsidiary to, directly or indirectly, consummate any Asset Disposition unless (1) the Company or such Restricted Subsidiary receives consideration at the time of such Asset Disposition at least equal to the Fair Market Value (including as to the value of all non-cash consideration), as determined in good faith by the Board of Directors of the Company, of the shares and assets subject to such Asset Disposition; (2) at least 75% of the consideration thereof received by the Company or such Restricted Subsidiary is in the form of cash or cash equivalents; and (3) an amount equal to 100% of the Net Available Cash from such Asset Disposition is applied by the Company (or such Restricted Subsidiary, as the case may be) to any of the following: (A) to prepay, repay, redeem or purchase Senior Indebtedness selected by the Company (in each case other than Indebtedness owed to the Company or an Affiliate of the Company) within one year from the later of the date of such Asset Disposition or the receipt of such Net Available Cash; (B) to acquire Additional Assets within one year from the later of the date of such Asset Disposition or the receipt of such Net Available Cash; and (C) to make an offer to the holders of the Securities (and to holders of other Senior Indebtedness designated by the Company) to purchase Securities

45

(and such other Senior Indebtedness) pursuant to and subject to the conditions contained in this Section 4.06; provided, however, that in connection with any prepayment, repayment or purchase of Indebtedness pursuant to clause (A) or (C) above, the Company or such Restricted Subsidiary shall permanently retire such Indebtedness and shall cause the related loan commitment (if any) to be permanently reduced in an amount equal to the principal amount so prepaid, repaid or purchased. Notwithstanding the foregoing provisions of this Section 4.06, the Company and the Restricted Subsidiaries shall not be required to apply any Net Available Cash in accordance with this Section 4.06(a) except to the extent that the aggregate Net Available Cash from all Asset Dispositions which is not applied in accordance with this Section 4.06(a) exceeds $7,500,000. Pending the final application of any Net Available Cash, the Company or any of the Restricted Subsidiaries may temporarily reduce outstanding revolving Indebtedness that is Senior Indebtedness or otherwise invest the Net Available Cash in any manner that is not prohibited by this Indenture.

          For the purposes of this Section 4.06(a), the following are deemed to be cash or cash equivalents: (i) the assumption or discharge of Senior Indebtedness of the Company or any Restricted Subsidiary (other than obligations in respect of Disqualified Stock of the Company or Preferred Stock of a Subsidiary Guarantor) and the release of the Company or such Restricted Subsidiary from all liability on such Indebtedness in connection with such Asset Disposition and (ii) securities received by the Company or any Restricted Subsidiary from the transferee that are promptly converted by the Company or such Restricted Subsidiary into cash, to the extent of the cash received in that conversion.

          (b) In the event of an Asset Disposition that requires the purchase of Securities (and other Senior Indebtedness) pursuant to Section 4.06(a)(3)(C), the Company shall purchase Securities tendered pursuant to an offer by the Company for the Securities (and such other Senior Indebtedness) (the “Offer”) at a purchase price of 100% of their principal amount (or, in the event such other Senior Indebtedness was issued with significant original issue discount, 100% of the accreted value thereof), without premium, plus accrued but unpaid interest (or, in respect of such other Senior Indebtedness, such lesser price, if any, as may be provided for by the terms of such Senior Indebtedness) in accordance with the procedures (including prorating in the event of oversubscription) set forth in Section 4.06(c). If the aggregate purchase price of securities tendered exceeds the Net Available Cash allotted to their purchase, the Company shall select the securities to be purchased on a pro rata basis but in round denominations, which in the case of the Securities will be denominations of $2,000 principal amount or $1,000 multiples thereof. The Company shall not be required to make an Offer to purchase Securities (and other Senior Indebtedness) pursuant to this Section 4.06 if the Net Available Cash available therefor is less than $7,500,000 (which lesser amount shall be carried forward for purposes of determining whether such an Offer is required with respect to the Net Available Cash from any subsequent Asset Disposition). Upon completion of such an Offer, Net Available Cash shall be deemed to be reduced by the aggregate amount of such Offer.

46

          (c) (1) Promptly, and in any event within 10 days after the Company becomes obligated to make an Offer, the Company shall deliver to the Trustee and send, by first-class mail to each Holder, a written notice stating that the Holder may elect to have his Securities purchased by the Company either in whole or in part (subject to prorating as described in Section 4.06(b) in the event the Offer is oversubscribed) in a minimum amount of $2,000 or larger integral multiples of $1,000 of principal amount, at the applicable purchase price. The notice shall specify a purchase date not less than 30 days nor more than 60 days after the date of such notice (the “Purchase Date”) and shall contain such information concerning the business of the Company which the Company in good faith believes will enable such Holders to make an informed decision (which at a minimum will include (A) the most recently filed Annual Report on Form 10-K (including audited consolidated financial statements) of the Company, the most recent subsequently filed Quarterly Report on Form 10-Q and any Current Report on Form 8-K of the Company filed subsequent to such Quarterly Report, other than Current Reports describing Asset Dispositions otherwise described in the offering materials (or corresponding successor reports), (B) a description of material developments in the Company’s business subsequent to the date of the latest of such Reports, and (C) if material, appropriate pro forma financial information) and all instructions and materials necessary to tender Securities pursuant to the Offer, together with the information contained in clause (3).

     (2) Not later than the date upon which written notice of an Offer is delivered to the Trustee as provided above, the Company shall deliver to the Trustee an Officers’ Certificate as to (A) the amount of the Offer (the “Offer Amount”), including information as to any other Senior Indebtedness included in the Offer, (B) the allocation of the Net Available Cash from the Asset Dispositions pursuant to which such Offer is being made and (C) the compliance of such allocation with the provisions of Section 4.06(a) and (b). On such date, the Company shall also irrevocably deposit with the Trustee or with a Paying Agent (or, if the Company is acting as its own Paying Agent, segregate and hold in trust) in Temporary Cash Investments, maturing on the last day prior to the Purchase Date or on the Purchase Date if funds are immediately available by open of business, an amount equal to the Offer Amount to be held for payment in accordance with the provisions of this Section. If the Offer includes other Senior Indebtedness, the deposit described in the preceding sentence may be made with any other paying agent pursuant to arrangements satisfactory to the Trustee. Upon the expiration of the period for which the Offer remains open (the “Offer Period”), the Company shall deliver to the Trustee for cancellation the Securities or portions thereof which have been properly tendered to and are to be accepted by the Company. The Trustee shall, on the Purchase Date, mail or deliver payment (or cause the delivery of payment) to each tendering Holder in the amount of the purchase price. In the event that the aggregate purchase price of the Securities delivered by the Company to the Trustee is less than the Offer Amount applicable to the Securities, the Trustee shall deliver the excess to the Company immediately after the expiration of the Offer Period for application in accordance with this Section 4.06.

47

     (3) Holders electing to have a Security purchased shall be required to surrender the Security, with an appropriate form duly completed, to the Company at the address specified in the notice at least three Business Days prior to the Purchase Date. Holders shall be entitled to withdraw their election if the Trustee or the Company receives not later than one Business Day prior to the Purchase Date, a telex, facsimile transmission or letter setting forth the name of the Holder, the principal amount of the Security which was delivered for purchase by the Holder and a statement that such Holder is withdrawing his election to have such Security purchased. Holders whose Securities are purchased only in part shall be issued new Securities equal in principal amount to the unpurchased portion of the Securities surrendered.

     (4) At the time the Company delivers Securities to the Trustee which are to be accepted for purchase, the Company shall also deliver an Officers’ Certificate stating that such Securities are to be accepted by the Company pursuant to and in accordance with the terms of this Section. A Security shall be deemed to have been accepted for purchase at the time the Trustee, directly or through an agent, mails or delivers payment therefor to the surrendering Holder.

          (d) The Company shall comply, to the extent applicable, with the requirements of Section 14(e) of the Exchange Act and any other securities laws or regulations in connection with the repurchase of Securities pursuant to this Section 4.06. To the extent that the provisions of any securities laws or regulations conflict with provisions of this Section 4.06, the Company shall comply with the applicable securities laws and regulations and shall not be deemed to have breached its obligations under this Section 4.06 by virtue of its compliance with such securities laws or regulations.

          SECTION 4.07. Limitation on Affiliate Transactions. (a) The Company shall not, and shall not permit any Restricted Subsidiary to, enter into or permit to exist any transaction (including the purchase, sale, lease or exchange of any property, employee compensation arrangements or the rendering of any service) with, or for the benefit of, any Affiliate of the Company (an “Affiliate Transaction”) unless: (1) the terms of the Affiliate Transaction are no less favorable to the Company or such Restricted Subsidiary than those that could be obtained at the time of the Affiliate Transaction in arm’s-length dealings with a Person who is not an Affiliate; (2) if such Affiliate Transaction involves an amount in excess of $10,000,000, the terms of the Affiliate Transaction are set forth in writing and a majority of the non-employee directors of the Company disinterested with respect to such Affiliate Transaction have determined in good faith that the criteria set forth in clause (1) are satisfied and have approved the relevant Affiliate Transaction as evidenced by a resolution of the Board of Directors of the Company; and (3) if such Affiliate Transaction involves an amount in excess of $20,000,000, the Board of Directors of the Company shall also have received a written opinion from an Independent Qualified Party to the effect that such Affiliate Transaction is fair, from a financial standpoint, to the Company and its Restricted Subsidiaries or is not less favorable to the Company and its Restricted Subsidiaries than could reasonably be expected to be obtained at the time in an arm’s-length transaction with a Person who was not an Affiliate.

48

          (b) The provisions of Section 4.07(a) shall not prohibit (1) any Investment (other than a Permitted Investment) or other Restricted Payment, in each case permitted to be made pursuant to (but only to the extent included in the calculation of the amount of Restricted Payments made pursuant to this Section 4.04(a)(3)); (2) any issuance of securities, or other payments, awards or grants in cash, securities or otherwise pursuant to, or the funding of, employment arrangements, stock options and stock ownership plans approved by the Board of Directors of the Company; (3) loans or advances to employees in the ordinary course of business in accordance with the past practices of the Company or its Restricted Subsidiaries, but in any event not to exceed $1,000,000 in the aggregate outstanding at any one time; (4) the payment of reasonable fees to directors of the Company and its Restricted Subsidiaries who are not employees of the Company or its Restricted Subsidiaries; (5) any transaction with the Company, a Restricted Subsidiary or joint venture or similar entity which would constitute an Affiliate Transaction solely because the Company or a Restricted Subsidiary owns an equity interest in or otherwise controls such Restricted Subsidiary, joint venture or similar entity; (6) the issuance or sale of any Capital Stock (other than Disqualified Stock) of the Company; (7) earn-out payments (A) made in connection with acquisitions permitted under this Indenture and (B) negotiated prior to the consummation of the applicable acquisition; and (8) any agreement as in effect on the Issue Date and described in the Confidential Offering Circular of the Company dated January 26, 2007 or any renewals or extensions of any such agreement (so long as such renewals or extensions are not less favorable to the Company or the Restricted Subsidiaries) and the transactions evidenced thereby.

          SECTION 4.08. Limitation on Line of Business. The Company shall not, and shall not permit any Restricted Subsidiary, to engage in any business other than a Related Business.

          SECTION 4.09. Change of Control. (a) Upon the occurrence of a Change of Control, each Holder shall have the right to require that the Company purchase such Holder’s Securities at a purchase price in cash equal to 101% of the principal amount thereof on the date of purchase plus accrued and unpaid interest, if any, to the date of purchase (subject to the right of Holders of record on the relevant record date to receive interest on the relevant interest payment date), in accordance with the terms contemplated in Section 4.09(b).

          (b) Within 30 days following any Change of Control, unless the Company shall have previously mailed a redemption notice with respect to all outstanding Securities as described under paragraph 5 of the Securities, the Company shall mail a notice to each Holder with a copy to the Trustee (the “Change of Control Offer”) stating:

     (1) that a Change of Control has occurred and that such Holder has the right to require the Company to purchase such Holder’s Securities at a purchase price in cash equal to 101% of the principal amount thereof on the date of purchase, plus accrued and unpaid interest, if any, to the date of purchase (subject

49

to the right of Holders of record on the relevant record date to receive interest on the relevant interest payment date);

     (2) the circumstances and relevant facts regarding such Change of Control (including information with respect to pro forma historical income, cash flow and capitalization, in each case after giving effect to such Change of Control);

     (3) the purchase date (which shall be no earlier than 30 days nor later than 60 days from the date such notice is mailed); and

     (4) the instructions, as determined by the Company, consistent with this Section, that a Holder must follow in order to have its Securities purchased.

          (c) Holders electing to have a Security purchased will be required to surrender the Security, with an appropriate form duly completed, to the Company at the address specified in the notice at least three Business Days prior to the purchase date. Holders will be entitled to withdraw their election if the Trustee or the Company receives not later than one Business Day prior to the purchase date, a telegram, telex, facsimile transmission or letter setting forth the name of the Holder, the principal amount of the Security which was delivered for purchase by the Holder and a statement that such Holder is withdrawing his election to have such Security purchased.

          (d) On the purchase date, all Securities purchased by the Company under this Section shall be delivered by the Company to the Trustee for cancellation, and the Company shall pay the purchase price plus accrued and unpaid interest, if any, to the Holders entitled thereto.

          (e) Notwithstanding the foregoing provisions of this Section 4.09, the Company shall not be required to make a Change of Control Offer following a Change of Control if a third party makes the Change of Control Offer in the manner, at the times and otherwise in compliance with the requirements set forth in this Section 4.09 applicable to a Change of Control Offer to be made by the Company and purchases all Securities validly tendered and not withdrawn under such Change of Control Offer.

          (f) A Change of Control Offer may be made in advance of a Change of Control, conditioned upon the occurrence of such Change of Control, if a definitive agreement is in place for the Change of Control at the time of making of the Change of Control Offer.

          (g) The Company shall comply, to the extent applicable, with the requirements of Section 14(e) of the Exchange Act and any other applicable securities laws or regulations in connection with the repurchase of Securities pursuant to this Section 4.09. To the extent that the provisions of any securities laws or regulations conflict with provisions of this Section, the Company shall comply with the applicable securities laws and regulations and shall not be deemed to have breached its obligations under this Section 4.09 by virtue of its compliance with such securities laws or regulations.

50

          SECTION 4.10. Limitation on Liens. The Company shall not, and shall not permit any Restricted Subsidiary to, directly or indirectly, Incur or permit to exist any Lien (the “Initial Lien”) of any nature whatsoever on any of its properties (including Capital Stock of a Restricted Subsidiary), whether owned at the Issue Date or thereafter acquired securing any Indebtedness, other than Permitted Liens, without effectively providing that the Securities shall be secured equally and ratably with (or prior to) the obligations so secured for so long as such obligations are so secured.

          Any Lien created for the benefit of the Holders of the Securities pursuant to the preceding sentence shall provide by its terms that such Lien shall be automatically and unconditionally released and discharged upon the release and discharge of the Initial Lien.

          SECTION 4.11. Limitation on Sale/Leaseback Transactions. The Company shall not, and shall not permit any Restricted Subsidiary to, enter into any Sale/Leaseback Transaction with respect to any property unless (a) the Company or such Restricted Subsidiary would be entitled to (1) Incur Indebtedness in an amount equal to the Attributable Debt with respect to such Sale/Leaseback Transaction pursuant to Section 4.03 and (2) create a Lien on such property securing such Attributable Debt without equally and ratably securing the Securities pursuant to Section 4.10, (b) the net proceeds received by the Company or any Restricted Subsidiary in connection with such Sale/Leaseback Transaction are at least equal to the Fair Market Value (as determined by the Board of Directors of the Company) of such property and (c) the Company applies the proceeds of such transaction in compliance with Section 4.06.

          SECTION 4.12. Future Guarantors. The Company shall cause each Domestic Restricted Subsidiary that Incurs any Indebtedness (other than Indebtedness permitted to be Incurred pursuant to Section 4.03(b)(2), (7), (8) or (9)) to, and each Foreign Subsidiary that enters into a Guarantee of any Indebtedness (other than a Foreign Subsidiary that Guarantees Indebtedness Incurred by another Foreign Subsidiary) to, in each case, at the same time, execute and deliver to the Trustee a Guaranty Agreement pursuant to which such Restricted Subsidiary will Guarantee payment of the Securities on the same terms and conditions as those set forth in Article 10 of this Indenture.

          SECTION 4.13. Compliance Certificate. The Company shall deliver to the Trustee within 120 days after the end of each fiscal year of the Company an Officers’ Certificate stating that in the course of the performance by the signers of their duties as Officers of the Company they would normally have knowledge of any Default and whether or not the signers know of any Default that occurred during such period. If they do, the certificate shall describe the Default, its status and what action the Company is taking or proposes to take with respect thereto. The Company also shall comply with TIA § 314(a)(4).

          SECTION 4.14. Further Instruments and Acts. Upon request of the Trustee, the Company will execute and deliver such further instruments and do such further acts as may be reasonably necessary or proper to carry out more effectively the purpose of this Indenture.

51

Article 5

Successor Company

          SECTION 5.01. When Company May Merge or Transfer Assets. (a) The Company shall not consolidate with or merge with or into, or convey, transfer or lease, in one transaction or a series of transactions, directly or indirectly, all or substantially all its assets to, any Person, unless:

     (1) the resulting, surviving or transferee Person (the “Successor Company”) shall be a Person organized and existing under the laws of the United States of America, any State thereof or the District of Columbia and the Successor Company (if not the Company) shall expressly assume, by an indenture supplemental thereto, executed and delivered to the Trustee, in form satisfactory to the Trustee, all the obligations of the Company under the Securities and this Indenture;

     (2) immediately after giving pro forma effect to such transaction (and treating any Indebtedness which becomes an obligation of the Successor Company or any Subsidiary as a result of such transaction as having been Incurred by the Successor Company or such Subsidiary at the time of such transaction), no Default shall have occurred and be continuing;

     (3) immediately after giving pro forma effect to such transaction, the Successor Company would be able to Incur an additional $1.00 of Indebtedness pursuant to Section 4.03(a); and

     (4) the Company shall have delivered to the Trustee an Officers’ Certificate and an Opinion of Counsel, each stating that such consolidation, merger or transfer and such supplemental indenture (if any) comply with this Indenture;

provided, however, that clause (3) will not be applicable to (A) a Restricted Subsidiary consolidating with, merging into or transferring all or part of its properties and assets to the Company (so long as no Capital Stock of the Company is distributed to any Person) or (B) the Company merging with an Affiliate of the Company solely for the purpose and with the sole effect of reincorporating the Company in another jurisdiction.

          For purposes of this Section 5.01, the sale, lease, conveyance, assignment, transfer or other disposition of all or substantially all of the properties and assets of one or more Subsidiaries of the Company, which properties and assets, if held by the Company instead of such Subsidiaries, would constitute all or substantially all of the properties and assets of the Company on a consolidated basis, shall be deemed to be the transfer of all or substantially all of the properties and assets of the Company.

          The Successor Company shall be the successor to the Company and shall succeed to, and be substituted for, and may exercise every right and power of, the

52

Company under this Indenture, and the predecessor Company in the case of a lease, shall be released from the obligation to pay the principal of and interest on the Securities.

          (b) The Company will not permit any Subsidiary Guarantor to consolidate with or merge with or into, or convey, transfer or lease, in one transaction or a series of transactions, all or substantially all of its assets to any Person unless: (1) the resulting, surviving or transferee Person (if not such Subsidiary) shall be a Person organized and existing under the laws of the jurisdiction under which such Subsidiary was organized or under the laws of the United States of America, or any State thereof or the District of Columbia, and such Person shall expressly assume, by a Guaranty Agreement, in a form satisfactory to the Trustee, all the obligations of such Subsidiary, if any, under its Subsidiary Guaranty, provided that the foregoing shall not be required in the case of a Subsidiary Guarantor (x) that has been disposed of in its entirety to another Person (other than to the Company or an Affiliate of the Company), whether through a merger, consolidation or sale of Capital Stock or assets or (y) that, as a result of the disposition of all or a portion of its Capital Stock, ceases to be a Subsidiary, in both cases, if in connection therewith the Company provides an Officers’ Certificate to the Trustee to the effect that the Company will comply with its obligations under Section 4.06 in respect of such disposition; (2) immediately after giving effect to such transaction or transactions on a pro forma basis (and treating any Indebtedness which becomes an obligation of the resulting, surviving or transferee Person as a result of such transaction as having been issued by such Person at the time of such transaction), no Default shall have occurred and be continuing; and (3) the Company delivers to the Trustee an Officers’ Certificate and an Opinion of Counsel, each stating that such consolidation, merger or transfer and such Guaranty Agreement, if any, complies with this Indenture.

Article 6

Defaults and Remedies

          SECTION 6.01. Events of Default. An “Event of Default” occurs if:

     (1) the Company defaults in any payment of interest on any Security when the same becomes due and payable, and such default continues for a period of 30 days;

     (2) the Company (A) defaults in the payment of the principal of any Security when the same becomes due and payable at its Stated Maturity, upon optional redemption, upon declaration of acceleration or otherwise, or (B) fails to redeem or purchase Securities when required pursuant to this Indenture or the Securities;

     (3) the Company fails to comply with Section 5.01;

     (4) the Company fails to comply with Section 4.02, 4.03, 4.04, 4.05, 4.06, 4.07, 4.08, 4.09, 4.10, 4.11 or 4.12 (other than a failure to purchase

53

Securities when required under Section 4.06 or 4.09) and such failure continues for 30 days after the notice specified below;

     (5) the Company or any Subsidiary Guarantor fails to comply with any of its agreements contained in the Securities or this Indenture (other than those referred to in clause (1), (2), (3) or (4) above) and such failure continues for 60 days after the notice specified below;

     (6) Indebtedness of the Company, any Subsidiary Guarantor or any Significant Subsidiary is not paid within any applicable grace period after final maturity or is accelerated by the holders thereof because of a default and the total amount of such Indebtedness unpaid or accelerated exceeds $30,000,000, or its foreign currency equivalent at the time;

     (7) the Company, a Subsidiary Guarantor or any Significant Subsidiary pursuant to or within the meaning of any Bankruptcy Law:

     (A) commences a voluntary case;

     (B) consents to the entry of an order for relief against it in an involuntary case;

     (C) consents to the appointment of a Custodian of it or for any substantial part of its property; or

     (D) makes a general assignment for the benefit of its creditors;

     or takes any comparable action under any foreign laws relating to insolvency;

     (8) a court of competent jurisdiction enters an order or decree under any Bankruptcy Law that:

     (A) is for relief against the Company, any Subsidiary Guarantor or any Significant Subsidiary in an involuntary case;

     (B) appoints a Custodian of the Company, any Subsidiary Guarantor or any Significant Subsidiary or for any substantial part of its property; or

     (C) orders the winding up or liquidation of the Company, any Subsidiary Guarantor or any Significant Subsidiary;

or any similar relief is granted under any foreign laws and the order or decree remains unstayed and in effect for 60 days;

     (9) any judgment or decree for the payment of money in excess of $30,000,000 or its foreign currency equivalent at the time is entered against the Company, any Subsidiary Guarantor or any Significant Subsidiary, remains

54

outstanding for a period of 60 consecutive days following the entry of such judgment or decree and is not discharged, waived or the execution thereof stayed; or

     (10) except as permitted by this Indenture, any Subsidiary Guaranty ceases to be in full force and effect (other than in accordance with the terms of such Subsidiary Guaranty) or any Subsidiary Guarantor denies or disaffirms its obligations under its Subsidiary Guaranty.

          The foregoing will constitute Events of Default whatever the reason for any such Event of Default and whether it is voluntary or involuntary or is effected by operation of law or pursuant to any judgment, decree or order of any court or any order, rule or regulation of any administrative or governmental body.

          The term “Bankruptcy Law” means Title 11, United States Code, or any similar Federal or state law for the relief of debtors. The term “Custodian” means any receiver, trustee, assignee, liquidator, custodian or similar official under any Bankruptcy Law.

          A Default under clauses (4) and (5) is not an Event of Default until the Trustee or the holders of 25% in principal amount of the outstanding Securities notify the Company of the Default and the Company does not cure such Default within the time specified after receipt of such notice. Such notice must specify the Default, demand that it be remedied and state that such notice is a “Notice of Default”.

          The Company shall deliver to the Trustee, within 30 days after the occurrence thereof, written notice in the form of an Officers’ Certificate of any Event of Default under clause (6) or (10) and any event which with the giving of notice or the lapse of time would become an Event of Default under clause (4), (5) or (9), its status and what action the Company is taking or proposes to take with respect thereto.

          SECTION 6.02. Acceleration. If an Event of Default (other than an Event of Default specified in Section 6.01(7) or (8) with respect to the Company) occurs and is continuing, the Trustee by notice to the Company, or the Holders of at least 25% in principal amount of the outstanding Securities by notice to the Company and the Trustee, may declare the principal of and accrued but unpaid interest on all the Securities to be due and payable. Upon such a declaration, such principal and interest shall be due and payable immediately. If an Event of Default specified in Section 6.01(7) or (8) with respect to the Company occurs, the principal of and interest on all the Securities shall ipso facto become and be immediately due and payable without any declaration or other act on the part of the Trustee or any Securityholders. The Holders of a majority in principal amount of the Securities by notice to the Trustee may rescind an acceleration and its consequences if the rescission would not conflict with any judgment or decree and if all existing Events of Default have been cured or waived except nonpayment of principal or interest that has become due solely because of acceleration. No such rescission shall affect any subsequent Default or impair any right consequent thereto.

55

          SECTION 6.03. Other Remedies. If an Event of Default occurs and is continuing, the Trustee may pursue any available remedy to collect the payment of principal of or interest on the Securities or to enforce the performance of any provision of the Securities or this Indenture.

          The Trustee may maintain a proceeding even if it does not possess any of the Securities or does not produce any of them in the proceeding. A delay or omission by the Trustee or any Securityholder in exercising any right or remedy accruing upon an Event of Default shall not impair the right or remedy or constitute a waiver of or acquiescence in the Event of Default. No remedy is exclusive of any other remedy. All available remedies are cumulative.

          SECTION 6.04. Waiver of Past Defaults. The Holders of a majority in principal amount of the Securities then outstanding by notice to the Trustee may waive an existing Default and its consequences or compliance with any provision of this Indenture except (a) a Default in the payment of the principal of or interest on a Security (b) a Default arising from the failure to redeem or purchase any Security when required pursuant to this Indenture or (c) a Default in respect of a provision that under Section 9.02 cannot be amended without the consent of each Securityholder affected. When a Default is waived, it is deemed cured, but no such waiver shall extend to any subsequent or other Default or impair any consequent right.

          SECTION 6.05. Control by Majority. The Holders of a majority in principal amount of the outstanding Securities may direct the time, method and place of conducting any proceeding for any remedy available to the Trustee or of exercising any trust or power conferred on the Trustee. However, the Trustee may refuse to follow any direction that conflicts with law or this Indenture or, subject to Section 7.01, that the Trustee determines is unduly prejudicial to the rights of other Securityholders or would involve the Trustee in personal liability; provided, however, that the Trustee may take any other action deemed proper by the Trustee that is not inconsistent with such direction. Prior to taking any action hereunder, the Trustee shall be entitled to indemnification satisfactory to it in its sole discretion against all losses and expenses caused by taking or not taking such action.

          SECTION 6.06. Limitation on Suits. Except to enforce the right to receive payment of principal, premium (if any) or interest when due, no Securityholder may pursue any remedy with respect to this Indenture or the Securities unless:

     (1) the Holder gives to the Trustee written notice stating that an Event of Default is continuing;

     (2) the Holders of at least 25% in principal amount of the outstanding Securities make a written request to the Trustee to pursue the remedy;

     (3) such Holder or Holders offer to the Trustee reasonable security or indemnity against any loss, liability or expense;

56

     (4) the Trustee does not comply with the request within 60 days after receipt of the request and the offer of security or indemnity; and

     (5) the Holders of a majority in principal amount of the outstanding Securities do not give the Trustee a direction inconsistent with the request during such 60-day period.

          A Securityholder may not use this Indenture to prejudice the rights of another Securityholder or to obtain a preference or priority over another Securityholder. In the event that the Definitive Securities are not issued to any beneficial owner promptly after the Registrar has received a request from the Holder of a Global Security to issue such Definitive Securities to such beneficial owner or its nominee, the Company expressly agrees and acknowledges, with respect to the right of any Holder to pursue a remedy pursuant to this Indenture, the right of such beneficial holder of Securities to pursue such remedy with respect to the portion of the Global Security that represents such beneficial holder’s Securities as if such Definitive Securities had been issued.

          SECTION 6.07. Rights of Holders to Receive Payment. Notwithstanding any other provision of this Indenture, the right of any Holder to receive payment of principal of and interest on the Securities held by such Holder, on or after the respective due dates expressed in the Securities, or to bring suit for the enforcement of any such payment on or after such respective dates, shall not be impaired or affected without the consent of such Holder.

          SECTION 6.08. Collection Suit by Trustee. If an Event of Default specified in Section 6.01(1) or (2) occurs and is continuing, the Trustee may recover judgment in its own name and as trustee of an express trust against the Company for the whole amount then due and owing (together with interest on any unpaid interest to the extent lawful) and the amounts provided for in Section 7.07.

          SECTION 6.09. Trustee May File Proofs of Claim. The Trustee may file such proofs of claim and other papers or documents as may be necessary or advisable in order to have the claims of the Trustee and the Securityholders allowed in any judicial proceedings relative to the Company, its creditors or its property and, unless prohibited by law or applicable regulations, may vote on behalf of the Holders in any election of a trustee in bankruptcy or other Person performing similar functions, and any Custodian in any such judicial proceeding is hereby authorized by each Holder to make payments to the Trustee and, in the event that the Trustee shall consent to the making of such payments directly to the Holders, to pay to the Trustee any amount due it for the reasonable compensation, expenses, disbursements and advances of the Trustee, its agents and its counsel, and any other amounts due the Trustee under Section 7.07.

          Priorities. If the Trustee collects any money or property pursuant to this Article 6, it shall pay out the money or property in the following order:

     FIRST: to the Trustee for amounts due under Section 7.07;

57

     SECOND: to Securityholders for amounts due and unpaid on the Securities for principal and interest, ratably, without preference or priority of any kind, according to the amounts due and payable on the Securities for principal and interest, respectively; and

     THIRD: to the Company.

          The Trustee may fix a record date and payment date for any payment to Securityholders pursuant to this Section. At least 15 days before such record date, the Company shall mail to each Securityholder and the Trustee a notice that states the record date, the payment date and amount to be paid.

          SECTION 6.10. Undertaking for Costs. In any suit for the enforcement of any right or remedy under this Indenture or in any suit against the Trustee for any action taken or omitted by it as Trustee, a court in its discretion may require the filing by any party litigant in the suit of an undertaking to pay the costs of the suit, and the court in its discretion may assess reasonable costs, including reasonable attorneys’ fees, against any party litigant in the suit, having due regard to the merits and good faith of the claims or defenses made by the party litigant. This Section does not apply to a suit by the Trustee, a suit by a Holder pursuant to Section 6.07 or a suit by Holders of more than 10% in aggregate principal amount of the Securities.

          SECTION 6.11. Waiver of Stay or Extension Laws. The Company (to the extent it may lawfully do so) shall not at any time insist upon, or plead, or in any manner whatsoever claim or take the benefit or advantage of, any stay or extension law wherever enacted, now or at any time hereafter in force, which may affect the covenants or the performance of this Indenture; and the Company (to the extent that it may lawfully do so) hereby expressly waives all benefit or advantage of any such law, and shall not hinder, delay or impede the execution of any power herein granted to the Trustee, but shall suffer and permit the execution of every such power as though no such law had been enacted.

Article 7

Trustee

          SECTION 7.01. Duties of Trustee. (a) If an Event of Default has occurred and is continuing, the Trustee shall exercise the rights and powers vested in it by this Indenture and use the same degree of care and skill in their exercise as a prudent Person would exercise or use under the circumstances in the conduct of such Person’s own affairs.

     (b) Except during the continuance of an Event of Default:

     (1) the Trustee undertakes to perform such duties and only such duties as are specifically set forth in this Indenture and no implied covenants or obligations shall be read into this Indenture against the Trustee; and

58

     (2) in the absence of bad faith on its part, the Trustee may conclusively rely, as to the truth of the statements and the correctness of the opinions expressed therein, upon certificates or opinions furnished to the Trustee and conforming to the requirements of this Indenture. However, the Trustee shall examine the certificates and opinions to determine whether or not they conform to the requirements of this Indenture.

          (c) The Trustee may not be relieved from liability for its own negligent action, its own negligent failure to act or its own wilful misconduct, except that:

     (1) this paragraph does not limit the effect of paragraph (b) of this Section;

     (2) the Trustee shall not be liable for any error of judgment made in good faith by a Trust Officer unless it is proved that the Trustee was negligent in ascertaining the pertinent facts; and

     (3) the Trustee shall not be liable with respect to any action it takes or omits to take in good faith in accordance with a direction received by it pursuant to Section 6.05.

          (d) Every provision of this Indenture that in any way relates to the Trustee is subject to paragraphs (a), (b) and (c) of this Section.

          (e) The Trustee shall not be liable for interest on any money received by it except as the Trustee may agree in writing with the Company.

          (f) Money held in trust by the Trustee need not be segregated from other funds except to the extent required by law.

          (g) No provision of this Indenture shall require the Trustee to expend or risk its own funds or otherwise incur financial liability in the performance of any of its duties hereunder or in the exercise of any of its rights or powers, if it shall have reasonable grounds to believe that repayment of such funds or adequate indemnity against such risk or liability is not reasonably assured to it.

          (h) Every provision of this Indenture relating to the conduct or affecting the liability of or affording protection to the Trustee shall be subject to the provisions of this Section and to the provisions of the TIA.

          SECTION 7.02. Rights of Trustee. (a) The Trustee may conclusively rely on any document believed by it to be genuine and to have been signed or presented by the proper person. The Trustee need not investigate any fact or matter stated in the document.

          (b) Before the Trustee acts or refrains from acting, it may require an Officers’ Certificate or an Opinion of Counsel. The Trustee shall not be liable for any

59

           action it takes or omits to take in good faith in reliance on the Officers’ Certificate or Opinion of Counsel.

          (c) The Trustee may act through agents and shall not be responsible for the misconduct or negligence of any agent appointed with due care.

          (d) The Trustee shall not be liable for any action it takes or omits to take in good faith which it believes to be authorized or within its rights or powers; provided, however, that the Trustee’s conduct does not constitute wilful misconduct or negligence.

          (e) The Trustee may consult with counsel, and the advice or opinion of counsel with respect to legal matters relating to this Indenture and the Securities shall be full and complete authorization and protection from liability in respect to any action taken, omitted or suffered by it hereunder in good faith and in accordance with the advice or opinion of such counsel.

          (f) The Trustee shall not be bound to make any investigation into the facts or matters stated in any resolution, certificate, statement, instrument, opinion, report, notice, request, consent, order, approval, bond, debenture, note or other paper or document unless requested in writing to do so by the Holders of not less than a majority in principal amount of the Securities at the time outstanding, but the Trustee, in its discretion, may make such further inquiry or investigation into such facts or matters as it may see fit, and, if the Trustee shall determine to make such further inquiry or investigation, it shall be entitled to examine the books, records and premises of the Company, personally or by agent or attorney, at the reasonable expense of the Company and shall incur no liability of any kind by reason of making or not making such inquiry or investigation.

          (g) The Trustee shall be under no obligation to exercise any of the rights or powers vested in it by this Indenture at the request or direction of any of the Holders pursuant to this Indenture, unless such Holders shall have offered to the Trustee security or indemnity satisfactory to the Trustee against the costs, expenses and liabilities which might be incurred by it in compliance with such request or direction.

          (h) The rights, privileges, protections, immunities and benefits given to the Trustee, including its right to be indemnified, are extended to, and shall be enforceable by, the Trustee in each of its capacities hereunder, and each agent, custodian and other Person employed by the Trustee to act hereunder.

          SECTION 7.03. Individual Rights of Trustee. The Trustee in its individual or any other capacity may become the owner or pledgee of Securities and may otherwise deal with the Company or its Affiliates with the same rights it would have if it were not Trustee. Any Paying Agent, Registrar, co-registrar or co-paying agent may do the same with like rights. However, the Trustee must comply with Sections 7.10 and 7.11.

60

          SECTION 7.04. Trustee’s Disclaimer. The Trustee shall not be responsible for and makes no representation as to the validity or adequacy of this Indenture or the Securities, it shall not be accountable for the Company’s use of the proceeds from the Securities, and it shall not be responsible for any statement of the Company in this Indenture or in any document issued in connection with the sale of the Securities or in the Securities other than the Trustee’s certificate of authentication.

          SECTION 7.05. Notice of Defaults. If a Default occurs, is continuing and is actually known to the Trustee, the Trustee shall mail to each Securityholder notice of the Default within 90 days after it occurs. Except in the case of a Default in the payment of principal of or interest on any Security (including payments pursuant to the mandatory redemption provisions of such Security, if any), the Trustee may withhold the notice if and so long as it in good faith determines that withholding the notice is not opposed to the interests of the Securityholders.

          SECTION 7.06. Reports by Trustee to Holders. As promptly as practicable after each May 15 beginning with the May 15 following the date of this Indenture, and in any event prior to July 15 in each year, the Trustee shall mail to each Securityholder a brief report dated as of May 15 that complies with TIA § 313(a) if and to the extent required thereby. The Trustee also shall comply with TIA § 313(b).

          A copy of each report at the time of its mailing to Securityholders shall be mailed to the Company and filed with the SEC and each stock exchange (if any) on which the Securities are listed. The Company agrees to notify promptly the Trustee whenever the Securities become listed on any stock exchange and of any delisting thereof.

          SECTION 7.07. Compensation and Indemnity. The Company shall pay to the Trustee from time to time reasonable compensation for its services. The Trustee’s compensation shall not be limited by any law on compensation of a trustee of an express trust. The Company shall reimburse the Trustee upon request for all reasonable out-of-pocket expenses incurred or made by it, including costs of collection, in addition to the compensation for its services. Such expenses shall include the reasonable compensation and expenses, disbursements and advances of the Trustee’s agents, counsel, accountants and experts. The Company and each Subsidiary Guarantor shall, jointly and severally, indemnify the Trustee against any and all loss, liability or expense (including reasonable attorneys’ fees) incurred by it in connection with the administration of this trust and the performance of its duties hereunder. The Trustee shall notify the Company promptly of any claim for which it may seek indemnity. Failure by the Trustee to so notify the Company shall not relieve the Company of its obligations hereunder, unless the Company is materially prejudiced by such failure. The Company shall defend the claim and the Trustee may have separate counsel and the Company shall pay the reasonable fees and expenses of such counsel. The Company need not reimburse any expense or indemnify against any loss, liability or expense incurred by the Trustee through the Trustee’s own wilful misconduct, negligence or bad faith.

61

          To secure the Company’s payment obligations in this Section, the Trustee shall have a lien prior to the Securities on all money or property held or collected by the Trustee other than money or property held in trust to pay principal of and interest on particular Securities.

          The Company’s payment obligations pursuant to this Section shall survive the discharge of this Indenture. When the Trustee incurs expenses after the occurrence of a Default specified in Section 6.01(7) or (8) with respect to the Company, the expenses are intended to constitute expenses of administration under the Bankruptcy Law.

          SECTION 7.08. Replacement of Trustee. The Trustee may resign at any time by so notifying the Company. The Holders of a majority in principal amount of the Securities may remove the Trustee by so notifying the Trustee and the Company in writing and may appoint a successor Trustee. The Company shall remove the Trustee if:

     (1) the Trustee fails to comply with Section 7.10;

     (2) the Trustee is adjudged bankrupt or insolvent;

     (3) a receiver or other public officer takes charge of the Trustee or its property; or

     (4) the Trustee otherwise becomes incapable of acting.

          If the Trustee resigns, is removed by the Company or by the Holders of a majority in principal amount of the Securities and such Holders do not reasonably promptly appoint a successor Trustee, or if a vacancy exists in the office of Trustee for any reason (the Trustee in such event being referred to herein as the retiring Trustee), the Company shall promptly appoint a successor Trustee.

          A successor Trustee shall deliver a written acceptance of its appointment to the retiring Trustee and to the Company. Thereupon the resignation or removal of the retiring Trustee shall become effective, and the successor Trustee shall have all the rights, powers and duties of the Trustee under this Indenture. The successor Trustee shall mail a notice of its succession to Securityholders. The retiring Trustee shall promptly transfer all property held by it as Trustee to the successor Trustee, subject to the lien provided for in Section 7.07.

          If a successor Trustee does not take office within 60 days after the retiring Trustee resigns or is removed, the retiring Trustee or the Holders of 10% in principal amount of the Securities may petition any court of competent jurisdiction for the appointment of a successor Trustee.

          If the Trustee fails to comply with Section 7.10, any Securityholder may petition any court of competent jurisdiction for the removal of the Trustee and the appointment of a successor Trustee.

62

          Notwithstanding the replacement of the Trustee pursuant to this Section, the Company’s obligations under Section 7.07 shall continue for the benefit of the retiring Trustee.

          SECTION 7.09. Successor Trustee by Merger. If the Trustee consolidates with, merges or converts into, or transfers all or substantially all its corporate trust business or assets to, another corporation or banking association, the resulting, surviving or transferee corporation without any further act shall be the successor Trustee, provided such corporation shall be otherwise qualified and eligible under this Article 7, without the execution or filing of any paper or any further act on the part of any of the other parties hereto.

          In case at the time such successor or successors by merger, conversion or consolidation to the Trustee shall succeed to the trusts created by this Indenture any of the Securities shall have been authenticated but not delivered, any such successor to the Trustee may adopt the certificate of authentication of any predecessor trustee, and deliver such Securities so authenticated; and in case at that time any of the Securities shall not have been authenticated, any successor to the Trustee may authenticate such Securities either in the name of any predecessor hereunder or in the name of the successor to the Trustee; and in all such cases such certificates shall have the full force which it is anywhere in the Securities or in this Indenture provided that the certificate of the Trustee shall have.

          SECTION 7.10. Eligibility; Disqualification. The Trustee shall at all times satisfy the requirements of TIA § 310(a). The Trustee shall have a combined capital and surplus of at least $50,000,000 as set forth in its most recent published annual report of condition. The Trustee shall comply with TIA § 310(b), subject to its right to apply for a stay of its duty to resign under the penultimate paragraph of TIA § 310(b); provided, however, that there shall be excluded from the operation of TIA § 310(b)(1) any indenture or indentures under which other securities or certificates of interest or participation in other securities of the Company are outstanding if the requirements for such exclusion set forth in TIA § 310(b)(1) are met.

          SECTION 7.11. Preferential Collection of Claims Against Company. The Trustee shall comply with TIA § 311(a), excluding any creditor relationship listed in TIA § 311(b). A Trustee who has resigned or been removed shall be subject to TIA § 311(a) to the extent indicated.

Article 8

Discharge of Indenture; Defeasance

          SECTION 8.01. Discharge of Liability on Securities; Defeasance. (a) When (1) the Company delivers to the Trustee all outstanding Securities (other than Securities replaced pursuant to Section 2.07) for cancellation or (2) all outstanding Securities have become due and payable, whether at maturity or on a redemption date as a result of the mailing of a notice of redemption pursuant to Article 3 hereof and the

63

Company irrevocably deposits with the Trustee funds sufficient to pay at maturity or upon redemption all outstanding Securities, including interest thereon to maturity or such redemption date (other than Securities replaced pursuant to Section 2.07), and if in either case the Company pays all other sums payable hereunder by the Company, then this Indenture shall, subject to Section 8.01(c), cease to be of further effect. The Trustee shall acknowledge satisfaction and discharge of this Indenture on demand of the Company accompanied by an Officers’ Certificate and an Opinion of Counsel and at the cost and expense of the Company.

          (b) Subject to Sections 8.01(c) and 8.02, the Company at any time may terminate (1) all its obligations under the Securities and this Indenture and have each Subsidiary Guarantor’s obligation discharged with respect to its Guarantee (“legal defeasance option”) or (2) its obligations under Sections 4.02, 4.03, 4.04, 4.05, 4.06, 4.07, 4.08, 4.09, 4.10, 4.11 and 4.12 and the operation of Sections 6.01(4), 6.01(6), 6.01(7), 6.01(8) and 6.01(9) (but, in the case of Sections 6.01(7) and (8), with respect only to Significant Subsidiaries and Subsidiary Guarantors) and the limitations contained in Section 5.01(a)(3) (“covenant defeasance option”). The Company may exercise its legal defeasance option notwithstanding its prior exercise of its covenant defeasance option.

          If the Company exercises its legal defeasance option, payment of the Securities may not be accelerated because of an Event of Default with respect thereto. If the Company exercises its covenant defeasance option, payment of the Securities may not be accelerated because of an Event of Default specified in Sections 6.01(4), 6.01(6), 6.01(7), 6.01(8) and 6.01(9) (but, in the case of Sections 6.01(7) and (8), with respect only to Significant Subsidiaries and Subsidiary Guarantors) or because of the failure of the Company to comply with Section 5.01(a)(3). If the Company exercises its legal defeasance option or its covenant defeasance option, each Subsidiary Guarantor, if any, shall be released from all its obligations with respect to its Subsidiary Guaranty.

          Upon satisfaction of the conditions set forth herein and upon request of the Company, the Trustee shall acknowledge in writing the discharge of those obligations that the Company terminates.

          (c) Notwithstanding clauses (a) and (b) above, the Company’s obligations in Sections 2.03, 2.04, 2.05, 2.06, 2.07, 2.08, 7.07 and 7.08 and in this Article 8 shall survive until the Securities have been paid in full. Thereafter, the Company’s obligations in Sections 7.07, 8.04 and 8.05 shall survive.

          SECTION 8.02. Conditions to Defeasance. The Company may exercise its legal defeasance option or its covenant defeasance option only if:

     (1) the Company irrevocably deposits in trust with the Trustee money or U.S. Government Obligations for the payment of principal of and interest on the Securities to maturity or redemption, as the case may be;

64

     (2) the Company delivers to the Trustee a certificate from a nationally recognized firm of independent accountants expressing their opinion that the payments of principal and interest when due and without reinvestment on the deposited U.S. Government Obligations plus any deposited money without investment will provide cash at such times and in such amounts as will be sufficient to pay principal and interest when due on all the Securities to maturity or redemption, as the case may be;

     (3) 123 days pass after the deposit is made and during the 123-day period no Default specified in Sections 6.01(7) or (8) with respect to the Company occurs which is continuing at the end of the period;

     (4) the deposit does not constitute a default under any other agreement binding on the Company;

     (5) the Company delivers to the Trustee an Opinion of Counsel to the effect that the trust resulting from the deposit does not constitute, or is qualified as, a regulated investment company under the Investment Company Act of 1940;

     (6) in the case of the legal defeasance option, the Company shall have delivered to the Trustee an Opinion of Counsel stating that (A) the Company has received from, or there has been published by, the Internal Revenue Service a ruling, or (B) since the date of this Indenture there has been a change in the applicable Federal income tax law, in either case to the effect that, and based thereon such Opinion of Counsel shall confirm that, the Securityholders will not recognize income, gain or loss for Federal income tax purposes as a result of such defeasance and will be subject to Federal income tax on the same amounts, in the same manner and at the same times as would have been the case if such defeasance had not occurred;

     (7) in the case of the covenant defeasance option, the Company shall have delivered to the Trustee an Opinion of Counsel to the effect that the Securityholders will not recognize income, gain or loss for Federal income tax purposes as a result of such covenant defeasance and will be subject to Federal income tax on the same amounts, in the same manner and at the same times as would have been the case if such covenant defeasance had not occurred; and

     (8) the Company delivers to the Trustee an Officers’ Certificate and an Opinion of Counsel, each stating that all conditions precedent to the defeasance and discharge of the Securities as contemplated by this Article 8 have been complied with.

          Before or after a deposit, the Company may make arrangements satisfactory to the Trustee for the redemption of Securities at a future date in accordance with Article 3.

          SECTION 8.03. Application of Trust Money. The Trustee shall hold in trust money or U.S. Government Obligations deposited with it pursuant to this

65

Article 8. It shall apply the deposited money and the money from U.S. Government Obligations through the Paying Agent and in accordance with this Indenture to the payment of principal of and interest on the Securities.

          SECTION 8.04. Repayment to Company. The Trustee and the Paying Agent shall promptly turn over to the Company upon request any excess money or securities held by them at any time which, in the written opinion of nationally recognized firm of independent public accountants delivered to the Trustee (which delivery shall only be required if Government Obligations have been so deposited), are in excess of the amount thereof which would then be required to be deposited to effect an equivalent discharge or defeasance in accordance with this Article.

          Subject to any applicable abandoned property law, the Trustee and the Paying Agent shall pay to the Company upon request any money held by them for the payment of principal or interest that remains unclaimed for two years, and, thereafter, Securityholders entitled to the money must look to the Company for payment as general creditors.

          SECTION 8.05. Indemnity for Government Obligations. The Company shall pay and shall indemnify the Trustee against any tax, fee or other charge imposed on or assessed against deposited U.S. Government Obligations or the principal and interest received on such U.S. Government Obligations.

          SECTION 8.06. Reinstatement. If the Trustee or Paying Agent is unable to apply any money or U.S. Government Obligations in accordance with this Article 8 by reason of any legal proceeding or by reason of any order or judgment of any court or governmental authority enjoining, restraining or otherwise prohibiting such application, the Company’s and each Subsidiary Guarantor’s obligations under this Indenture, each Subsidiary Guaranty and the Securities shall be revived and reinstated as though no deposit had occurred pursuant to this Article 8 until such time as the Trustee or Paying Agent is permitted to apply all such money or U.S. Government Obligations in accordance with this Article 8; provided, however, that, if the Company has made any payment of interest on or principal of any Securities because of the reinstatement of its obligations, the Company shall be subrogated to the rights of the Holders of such Securities to receive such payment from the money or U.S. Government Obligations held by the Trustee or Paying Agent.

Article 9

Amendments

          SECTION 9.01. Without Consent of Holders. The Company, the Subsidiary Guarantors (with respect to a Subsidiary Guaranty or any provision of this Indenture to which it is a party) and the Trustee may amend, modify or supplement this Indenture or the Securities without notice to or consent of any Securityholder:

     (1) to cure any ambiguity, omission, defect or inconsistency;

66

     (2) to comply with Article 5;

     (3) to provide for uncertificated Securities in addition to or in place of certificated Securities; provided, however, that the uncertificated Securities are issued in registered form for purposes of Section 163(f) of the Code or in a manner such that the uncertificated Securities are described in Section 163(f)(2)(B) of the Code;

     (4) to add Guarantees with respect to the Securities, including any Subsidiary Guaranties, or to secure the Securities;

     (5) to add to the covenants of the Company or any Subsidiary Guarantor for the benefit of the Holders or to surrender any right or power herein conferred upon the Company or any Subsidiary Guarantor;

     (6) to comply with any requirements of the SEC in connection with qualifying, or maintaining the qualification of, this Indenture under the TIA;

     (7) to make any change that does not adversely affect the rights of any Securityholder;

     (8) to make any amendment to the provisions of this Indenture relating to the transfer and legending of Securities; provided, however, that (a) compliance with this Indenture as so amended would not result in Securities being transferred in violation of the Securities Act or any other applicable securities law and (b) such amendment does not materially and adversely affect the rights of Holders to transfer Securities;

     (9) to conform the text of this Indenture, the Securities and the Subsidiary Guaranties to any provision of the “Description of the Notes” Section of the Confidential Offering Circular of the Company dated January 26, 2007, to the extent that such provision in such Section was intended to be a verbatim recitation of a provision of this Indenture, the Securities or the Subsidiary Guaranties;

     (10) to provide for the issuance of the Exchange Securities; or

     (11) to evidence and provide for the acceptance and appointment of a successor Trustee.

          After an amendment under this Section becomes effective, the Company shall mail to Securityholders a notice briefly describing such amendment. The failure to give such notice to all Securityholders, or any defect therein, shall not impair or affect the validity of an amendment under this Section.

          SECTION 9.02. With Consent of Holders. The Company, the Subsidiary Guarantors and the Trustee may amend this Indenture or the Securities with the written consent of the Holders of at least a majority in principal amount of the

67

Securities then outstanding (including consents obtained in connection with a tender offer or exchange for the Securities) and any past default or compliance with any provisions may also be waived with the consent of the Holders of at least a majority in principal amount of the Securities then outstanding. However, without the consent of each Securityholder affected thereby, an amendment or waiver may not:

     (1) reduce the amount of Securities whose Holders must consent to an amendment;

     (2) reduce the rate of or extend the time for payment of interest on any Security;

     (3) reduce the principal of or change the Stated Maturity of any Security;

     (4) reduce the amount payable upon the redemption of any Security or change the time at which any Security may be redeemed as described in Article 3 hereto or paragraph 5 of the Securities;

     (5) make any Security payable in money other than that stated in the Security;

     (6) make any changes in the ranking or priority of any Security that would adversely affect the Securityholders;

     (7) make any change in Section 6.04 or 6.07 or the second sentence of this Section; or

     (8) make any change in, or release other than in accordance with the terms of this Indenture, any Subsidiary Guaranty that would adversely affect the Securityholders.

          It shall not be necessary for the consent of the Holders under this Section to approve the particular form of any proposed amendment, but it shall be sufficient if such consent approves the substance thereof.

          After an amendment under this Section becomes effective, the Company shall mail to Securityholders a notice briefly describing such amendment. The failure to give such notice to all Securityholders, or any defect therein, shall not impair or affect the validity of an amendment under this Section.

          SECTION 9.03. Compliance with Trust Indenture Act. Every amendment to this Indenture or the Securities shall comply with the TIA as then in effect.

          SECTION 9.04. Revocation and Effect of Consents and Waivers. A consent to an amendment or a waiver by a Holder of a Security shall bind the Holder and every subsequent Holder of that Security or portion of the Security that evidences the same debt as the consenting Holder’s Security, even if notation of the consent or waiver

68

is not made on the Security. However, any such Holder or subsequent Holder may revoke the consent or waiver as to such Holder’s Security or portion of the Security if the Trustee receives the notice of revocation before the date the amendment or waiver becomes effective. After an amendment or waiver becomes effective, it shall bind every Securityholder. An amendment or waiver becomes effective upon the execution of such amendment or waiver by the Trustee.

          The Company may, but shall not be obligated to, fix a record date for the purpose of determining the Securityholders entitled to give their consent or take any other action described above or required or permitted to be taken pursuant to this Indenture. If a record date is fixed, then notwithstanding the immediately preceding paragraph, those Persons who were Securityholders at such record date (or their duly designated proxies), and only those Persons, shall be entitled to give such consent or to revoke any consent previously given or to take any such action, whether or not such Persons continue to be Holders after such record date. No such consent shall be valid or effective for more than 120 days after such record date.

          SECTION 9.05. Notation on or Exchange of Securities. If an amendment changes the terms of a Security, the Trustee may require the Holder of the Security to deliver it to the Trustee. The Trustee may place an appropriate notation on the Security regarding the changed terms and return it to the Holder. Alternatively, if the Company or the Trustee so determines, the Company in exchange for the Security shall issue and the Trustee shall authenticate a new Security that reflects the changed terms. Failure to make the appropriate notation or to issue a new Security shall not affect the validity of such amendment.

          SECTION 9.06. Trustee To Sign Amendments. The Trustee shall sign any amendment authorized pursuant to this Article 9 if the amendment does not adversely affect the rights, duties, liabilities or immunities of the Trustee. If it does, the Trustee may but need not sign it. In signing such amendment the Trustee shall be entitled to receive indemnity reasonably satisfactory to it and to receive, and (subject to Section 7.01) shall be fully protected in relying upon, an Officers’ Certificate and an Opinion of Counsel stating that such amendment is authorized or permitted by this Indenture and that such amendment, supplement or waiver is the legal, valid and binding obligation of the Company and the Subsidiary Guarantors, enforceable against them in accordance with its terms, subject to customary exceptions, and complies with the provisions hereof (including Section 9.03).

          SECTION 9.07. Payment for Consent. Neither the Company nor any Affiliate of the Company shall, directly or indirectly, pay or cause to be paid any consideration, whether by way of interest, fee or otherwise, to any Holder for or as an inducement to any consent, waiver or amendment of any of the terms or provisions of this Indenture or the Securities unless such consideration is offered to all Holders and is paid to all Holders that so consent, waive or agree to amend in the time frame set forth in solicitation documents relating to such consent, waiver or agreement.

69

Article 10

Subsidiary Guaranties

          SECTION 10.01. Guaranties. Each Subsidiary Guarantor hereby unconditionally and irrevocably guarantees, jointly and severally, to each Holder and to the Trustee and its successors and assigns (a) the full and punctual payment of principal of and interest on the Securities when due, whether at maturity, by acceleration, by redemption or otherwise, and all other monetary obligations of the Company under this Indenture and the Securities and (b) the full and punctual performance within applicable grace periods of all other obligations of the Company under this Indenture and the Securities (all the foregoing being hereinafter collectively called the “Guaranteed Obligations”). Each Subsidiary Guarantor further agrees that the Guaranteed Obligations may be extended or renewed, in whole or in part, without notice or further assent from such Subsidiary Guarantor and that such Subsidiary Guarantor will remain bound under this Article 10 notwithstanding any extension or renewal of any Guaranteed Obligation.

          Each Subsidiary Guarantor waives presentation to, demand of, payment from and protest to the Company of any of the Guaranteed Obligations and also waives notice of protest for nonpayment. Each Subsidiary Guarantor waives notice of any default under the Securities or the Guaranteed Obligations. The obligations of each Subsidiary Guarantor hereunder shall not be affected by (1) the failure of any Holder or the Trustee to assert any claim or demand or to enforce any right or remedy against the Company or any other Person (including any Subsidiary Guarantor) under this Indenture, the Securities or any other agreement or otherwise; (2) any extension or renewal of any thereof; (3) any rescission, waiver, amendment or modification of any of the terms or provisions of this Indenture, the Securities or any other agreement; (4) the release of any security held by any Holder or the Trustee for the Guaranteed Obligations or any of them; (5) the failure of any Holder or the Trustee to exercise any right or remedy against any other guarantor of the Guaranteed Obligations; or (6) any change in the ownership of such Subsidiary Guarantor (except as expressly set forth in Section 10.06).

          Each Subsidiary Guarantor further agrees that its Subsidiary Guaranty herein constitutes a guarantee of payment, performance and compliance when due (and not a guarantee of collection) and waives any right to require that any resort be had by any Holder or the Trustee to any security held for payment of the Guaranteed Obligations.

          Except as expressly set forth in Sections 8.01(b), 10.02 and 10.06, the obligations of each Subsidiary Guarantor hereunder shall not be subject to any reduction, limitation, impairment or termination for any reason, including any claim of waiver, release, surrender, alteration or compromise, and shall not be subject to any defense of setoff, counterclaim, recoupment or termination whatsoever or by reason of the invalidity, illegality or unenforceability of the Guaranteed Obligations or otherwise. Without limiting the generality of the foregoing, the obligations of each Subsidiary Guarantor herein shall not be discharged or impaired or otherwise affected by the failure of any Holder or the Trustee to assert any claim or demand or to enforce any remedy

70

under this Indenture, the Securities or any other agreement, by any waiver or modification of any thereof, by any default, failure or delay, willful or otherwise, in the performance of the obligations, or by any other act or thing or omission or delay to do any other act or thing which may or might in any manner or to any extent vary the risk of such Subsidiary Guarantor or would otherwise operate as a discharge of such Subsidiary Guarantor as a matter of law or equity.

          Each Subsidiary Guarantor further agrees that its Guarantee herein shall continue to be effective or be reinstated, as the case may be, if at any time payment, or any part thereof, of principal of or interest on any Obligation is rescinded or must otherwise be restored by any Holder or the Trustee upon the bankruptcy or reorganization of the Company or otherwise.

          In furtherance of the foregoing and not in limitation of any other right which any Holder or the Trustee has at law or in equity against any Subsidiary Guarantor by virtue hereof, upon the failure of the Company to pay the principal of or interest on any Guaranteed Obligation when and as the same shall become due, whether at maturity, by acceleration, by redemption or otherwise, or to perform or comply with any other Guaranteed Obligation, each Subsidiary Guarantor hereby promises to and shall, upon receipt of written demand by the Trustee, forthwith pay, or cause to be paid, in cash, to the Holders or the Trustee an amount equal to the sum of (A) the unpaid amount of such Guaranteed Obligations, (B) accrued and unpaid interest on such Guaranteed Obligations (but only to the extent not prohibited by law) and (C) all other monetary Guaranteed Obligations of the Company to the Holders and the Trustee.

          Each Subsidiary Guarantor agrees that, as between it, on the one hand, and the Holders and the Trustee, on the other hand, (i) the maturity of the Guaranteed Obligations hereby may be accelerated as provided in Article 6 for the purposes of such Subsidiary Guarantor’s Subsidiary Guaranty herein, notwithstanding any stay, injunction or other prohibition preventing such acceleration in respect of the Guaranteed Obligations guaranteed hereby, and (ii) in the event of any declaration of acceleration of such Guaranteed Obligations as provided in Article 6, such Guaranteed Obligations (whether or not due and payable) shall forthwith become due and payable by such Subsidiary Guarantor for the purposes of this Section.

          Each Subsidiary Guarantor also agrees to pay any and all costs and expenses (including reasonable attorneys’ fees) incurred by the Trustee or any Holder in enforcing any rights under this Section.

          SECTION 10.02. Limitation on Liability. Any term or provision of this Indenture to the contrary notwithstanding, the maximum aggregate amount of the Guaranteed Obligations guaranteed hereunder by any Subsidiary Guarantor shall not exceed the maximum amount that can be hereby guaranteed without rendering this Indenture, as it relates to such Subsidiary Guarantor, voidable under applicable law relating to fraudulent conveyance or fraudulent transfer or similar laws affecting the rights of creditors generally.

71

          SECTION 10.03. Successors and Assigns. This Article 10 shall be binding upon each Subsidiary Guarantor and its successors and assigns and shall enure to the benefit of the successors and assigns of the Trustee and the Holders and, in the event of any transfer or assignment of rights by any Holder or the Trustee in accordance with this Indenture and the Securities, the rights and privileges conferred upon that party in this Indenture and in the Securities shall automatically extend to and be vested in such transferee or assignee, all subject to the terms and conditions of this Indenture.

          SECTION 10.04. No Waiver. Neither a failure nor a delay on the part of either the Trustee or the Holders in exercising any right, power or privilege under this Article 10 shall operate as a waiver thereof, nor shall a single or partial exercise thereof preclude any other or further exercise of any right, power or privilege. The rights, remedies and benefits of the Trustee and the Holders herein expressly specified are cumulative and not exclusive of any other rights, remedies or benefits which either may have under this Article 10 at law, in equity, by statute or otherwise.

          SECTION 10.05. Modification. No modification, amendment or waiver of any provision of this Article 10, nor the consent to any departure by any Subsidiary Guarantor therefrom, shall in any event be effective unless the same shall be in writing and signed by the Trustee, and then such waiver or consent shall be effective only in the specific instance and for the purpose for which given. No notice to or demand on any Subsidiary Guarantor in any case shall entitle such Subsidiary Guarantor to any other or further notice or demand in the same, similar or other circumstances.

          SECTION 10.06. Release of Subsidiary Guarantor. A Subsidiary Guarantor will be released from its obligations under this Article 10 (other than any obligation that may have arisen under Section 10.07)

     (1) upon the sale, disposition or other transfer (including by way of consolidation or merger) of the Capital Stock (including any sale, disposition or other transfer following which the applicable Subsidiary Guarantor is no longer a Restricted Subsidiary), or all or substantially all the assets, of the applicable Subsidiary Guarantor if such sale, disposition or other transfer is made in compliance with this Indenture, in each case other than to the Company or a Subsidiary of the Company; provided, however, that such Subsidiary Guarantor is released from its guarantees, if any, of, and all pledges and security, if any, granted in connection with, the Term B Senior Credit Facility and any other Indebtedness of the Company or of any Restricted Subsidiary of the Company,

     (2) upon the designation of such Subsidiary Guarantor as an Unrestricted Subsidiary in accordance with the terms of this Indenture,

     (3) upon the release or discharge of all Guarantees by such Restricted Subsidiary and the repayment of all Indebtedness of such Restricted Subsidiary which, if Incurred by such Restricted Subsidiary, would require such Restricted Subsidiary to Guarantee the Securities under Section 4.12,

72

     (4) upon defeasance of the Securities pursuant to Article 8, or

     (5) upon the full satisfaction of the Company’s obligations under this Indenture pursuant to Section 8.01(a) or otherwise in accordance with the terms of this Indenture;

provided, however, that in the case of clauses (1) and (2) above, (i) such sale or other disposition is made to a Person other than the Company or a Subsidiary of the Company, (ii) such sale or disposition is otherwise permitted by this Indenture and (iii) the Company provides an Officers’ Certificate to the Trustee to the effect that the Company will comply with its obligations under Section 4.06.

At the request of the Company, the Trustee shall, at the sole cost and expense of the Company and upon receipt at the reasonable request of the Trustee of an Opinion of Counsel and Officer’s Certificate that the provision of this Section 10.06 have been complied with, execute and deliver an appropriate instrument evidencing such release.

          SECTION 10.07. Contribution. Each Subsidiary Guarantor that makes a payment under its Subsidiary Guaranty shall be entitled upon payment in full of all Guaranteed Obligations under this Indenture to a contribution from each other Subsidiary Guarantor in an amount equal to such other Subsidiary Guarantor’s pro rata portion of such payment based on the respective net assets of all the Subsidiary Guarantors at the time of such payment determined in accordance with GAAP.

Article 11

Miscellaneous

          SECTION 11.01. Trust Indenture Act Controls. If any provision of this Indenture limits, qualifies or conflicts with another provision which is required to be included in this Indenture by the TIA, the required provision shall control.

          SECTION 11.02. Notices. Any notice or communication shall be in writing and delivered in person or mailed by first-class mail addressed as follows:

73

if to the Company or any Subsidiary Guarantor:

Alion Science and Technology Corporation
1750 Tysons Boulevard
Suite 1300
McLean, VA 22102

Attention of:
James Fontana, Esq.
General Counsel

if to the Trustee:
Wilmington Trust Company
1100 North Market Street
Wilmington, DE 19890-1615

Attention of:
Corporate Trust Department

          The Company, any Subsidiary Guarantor or the Trustee by notice to the other may designate additional or different addresses for subsequent notices or communications.

          Any notice or communication mailed to a Securityholder shall be mailed to the Securityholder at the Securityholder’s address as it appears on the registration books of the Registrar and shall be sufficiently given if so mailed within the time prescribed.

          Failure to mail a notice or communication to a Securityholder or any defect in it shall not affect its sufficiency with respect to other Securityholders. If a notice or communication is mailed in the manner provided above, it is duly given, whether or not the addressee receives it.

          SECTION 11.03. Communication by Holders with Other Holders. Securityholders may communicate pursuant to TIA § 312(b) with other Securityholders with respect to their rights under this Indenture or the Securities. The Company, any Subsidiary Guarantor, the Trustee, the Registrar and anyone else shall have the protection of TIA § 312(c).

          SECTION 11.04. Certificate and Opinion as to Conditions Precedent. Upon any request or application by the Company to the Trustee to take or refrain from taking any action under this Indenture, the Company shall furnish to the Trustee:

     (1) an Officers’ Certificate in form and substance reasonably satisfactory to the Trustee stating that, in the opinion of the signer, all conditions precedent, if any, provided for in this Indenture relating to the proposed action have been complied with; and

74

     (2) an Opinion of Counsel in form and substance reasonably satisfactory to the Trustee stating that, in the opinion of such counsel, all such conditions precedent have been complied with.

          SECTION 11.05. Statements Required in Certificate or Opinion. Each certificate or opinion with respect to compliance with a covenant or condition provided for in this Indenture shall include:

     (1) a statement that the individual making such certificate or opinion has read such covenant or condition;

     (2) a brief statement as to the nature and scope of the examination or investigation upon which the statements or opinions contained in such certificate or opinion are based;

     (3) a statement that, in the opinion of such individual, he has made such examination or investigation as is necessary to enable him to express an informed opinion as to whether or not such covenant or condition has been complied with; and

     (4) a statement as to whether or not, in the opinion of such individual, such covenant or condition has been complied with.

          SECTION 11.06. When Securities Disregarded. In determining whether the Holders of the required principal amount of Securities have concurred in any direction, waiver or consent, Securities owned by the Company or by any Person directly or indirectly controlling or controlled by or under direct or indirect common control with the Company shall be disregarded and deemed not to be outstanding, except that, for the purpose of determining whether the Trustee shall be protected in relying on any such direction, waiver or consent, only Securities which the Trustee knows are so owned shall be so disregarded. Also, subject to the foregoing, only Securities outstanding at the time shall be considered in any such determination.

          SECTION 11.07. Rules by Trustee, Paying Agent and Registrar. The Trustee may make reasonable rules for action by or a meeting of Securityholders. The Registrar and the Paying Agent may make reasonable rules for their functions.

          SECTION 11.08. Legal Holidays. If a payment date is a Legal Holiday, payment shall be made on the next succeeding day that is not a Legal Holiday, and no interest shall accrue for the intervening period. If a regular record date is a Legal Holiday, the record date shall not be affected.

          SECTION 11.09. Governing Law. This Indenture and the Securities shall be governed by, and construed in accordance with, the laws of the State of New York.

          SECTION 11.10. No Recourse Against Others. A director, officer, employee, incorporator or stockholder, as such, of the Company or any Subsidiary

75

Guarantor shall not have any liability for any obligations of the Company under the Securities or this Indenture or of such Subsidiary Guarantor under its Subsidiary Guaranty, or this Indenture or for any claim based on, in respect of or by reason of such obligations or their creation. By accepting a Security, each Securityholder shall waive and release all such liability. The waiver and release shall be part of the consideration for the issue of the Securities.

          SECTION 11.11. Successors. All agreements of the Company in this Indenture and the Securities shall bind its successors. All agreements of the Trustee in this Indenture shall bind its successors.

          SECTION 11.12. Multiple Originals. The parties may sign any number of copies of this Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. One signed copy is enough to prove this Indenture.

          SECTION 11.13. Table of Contents; Headings. The table of contents, cross-reference sheet and headings of the Articles and Sections of this Indenture have been inserted for convenience of reference only, are not intended to be considered a part hereof and shall not modify or restrict any of the terms or provisions hereof.

76

          IN WITNESS WHEREOF, the parties have caused this Indenture to be duly executed as of the date first written above.

ALION SCIENCE AND TECHNOLOGY CORPORATION,
By	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Executive VP and CFO
HUMAN FACTORS APPLICATION, INC.,
By	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer
ALION — METI CORPORATION,
by	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer
ALION — CATI CORPORATION,
by	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer
ALION — JJMA CORPORATION,
by	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer

77

ALION — BMH CORPORATION,
by	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer
WASHINGTON CONSULTING, INC.,
by	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer
ALION — MA&D CORPORATION,
by	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer

78

WILMINGTON TRUST COMPANY,
By	/s/ James S. McGinley
	Name:  James S. McGinley
	Title:  Authorized Signer

RULE 144A/REGULATION S APPENDIX

PROVISIONS RELATING TO INITIAL SECURITIES,
PRIVATE EXCHANGE SECURITIES
AND EXCHANGE SECURITIES

     1. Definitions

     1.1 Definitions

          For the purposes of this Appendix the following terms shall have the meanings indicated below:

          “Applicable Procedures” means, with respect to any transfer or transaction involving a Temporary Regulation S Global Security or beneficial interest therein, the rules and procedures of the Depository for such a Temporary Regulation S Global Security, to the extent applicable to such transaction and as in effect from time to time.

          “Definitive Security” means a certificated Initial Security or Exchange Security or Private Exchange Security bearing, if required, the appropriate restricted securities legend set forth in Section 2.3(e).

          “Depository” means The Depository Trust Company, its nominees and their respective successors.

          “Distribution Compliance Period”, with respect to any Securities, means the period of 40 consecutive days beginning on and including the later of (i) the day on which such Securities are first offered to Persons other than distributors (as defined in Regulation S under the Securities Act) in reliance on Regulation S and (ii) the issue date with respect to such Securities.

          “Exchange Securities” means (1) the 10¹/4% Senior Notes due 2015 issued pursuant to the Indenture in connection with a Registered Exchange Offer pursuant to a Registration Rights Agreement and (2) Additional Securities, if any, issued pursuant to a registration statement filed with the SEC under the Securities Act.

          “IAI” means an institutional “accredited investor”, as defined in Rule 501(a)(1), (2), (3) and (7) of Regulation D under the Securities Act.

          “Initial Purchaser” means (1) with respect to the Initial Securities issued on the Issue Date, Credit Suisse Securities (USA) LLC, and (2) with respect to each issuance of Additional Securities, the Persons purchasing such Additional Securities under the related Purchase Agreement.

          “Initial Securities” means (1) $250,000,000 aggregate principal amount of 10¹/4% Senior Notes due 2015 issued on the Issue Date and (2) Additional Securities, if any, issued in a transaction exempt from the registration requirements of the Securities Act.

2

          “Private Exchange” means the offer by the Company, pursuant to a Registration Rights Agreement, to the Initial Purchaser to issue and deliver to the Initial Purchaser, in exchange for the Initial Securities held by the Initial Purchaser as part of its initial distribution, a like aggregate principal amount of Private Exchange Securities.

          “Private Exchange Securities” means any 10¹/4% Senior Notes due 2015 issued in connection with a Private Exchange.

          “Purchase Agreement” means (1) with respect to the Initial Securities issued on the Issue Date, the Purchase Agreement dated January 26, 2007, among the Company, the Subsidiary Guarantors and the Initial Purchaser, and (2) with respect to each issuance of Additional Securities, the purchase agreement or underwriting agreement among the Company and the Persons purchasing such Additional Securities.

          “QIB” means a “qualified institutional buyer” as defined in Rule 144A.

          “Registered Exchange Offer” means the offer by the Company, pursuant to a Registration Rights Agreement, to certain Holders of Initial Securities, to issue and deliver to such Holders, in exchange for the Initial Securities, a like aggregate principal amount of Exchange Securities registered under the Securities Act.

          “Registration Rights Agreement” means (1) with respect to the Initial Securities issued on the Issue Date, the Registration Rights Agreement dated February 8, 2007 among the Company, the Subsidiary Guarantors and the Initial Purchaser and (2) with respect to each issuance of Additional Securities issued in a transaction exempt from the registration requirements of the Securities Act, the registration rights agreement, if any, among the Company and the Persons purchasing such Additional Securities under the related Purchase Agreement.

          “Rule 144A Securities” means all Securities offered and sold to QIBs in reliance on Rule 144A.

          “Securities” means the Initial Securities, the Exchange Securities and the Private Exchange Securities, treated as a single class.

          “Securities Act” means the Securities Act of 1933.

          “Securities Custodian” means the custodian with respect to a Global Security (as appointed by the Depository), or any successor Person thereto and shall initially be the Trustee.

          “Shelf Registration Statement” means the registration statement issued by the Company in connection with the offer and sale of Initial Securities or Private Exchange Securities pursuant to a Registration Rights Agreement.

          “Transfer Restricted Securities” means Securities that bear or are required to bear the legend relating to restrictions on transfer relating to the Securities Act set forth in Section 2.3(e) hereto.

3

     1.2 Other Definitions

	Defined in
Term	Section:
“Agent Members”		2.1	(b)
“Global Securities”		2.1	(a)
“IAI Global Security”		2.1	(a)
“Permanent Regulation S Global Security”		2.1	(a)
“Regulation S”		2.1	(a)
“Regulation S Global Security”		2.1	(a)
“Rule 144A”		2.1	(a)
“Rule 144A Global Security”		2.1	(a)
“Temporary Regulation S Global Security”		2.1	(a)

     2. The Securities.

     2.1 (a) Form and Dating. The Initial Securities will be offered and sold by the Company pursuant to a Purchase Agreement. The Initial Securities will be resold initially only to (i) QIBs in reliance on Rule 144A under the Securities Act (“Rule 144A”) and (ii) Persons other than U.S. Persons (as defined in Regulation S) in reliance on Regulation S under the Securities Act (“Regulation S”). Initial Securities may thereafter be transferred to, among others, QIBs, IAIs and purchasers in reliance on Regulation S, subject to the restrictions on transfer set forth herein. Initial Securities initially resold pursuant to Rule 144A shall be issued initially in the form of one or more permanent global Securities in definitive, fully registered form (collectively, the “Rule 144A Global Security”); Initial Securities initially resold to IAIs shall be issued initially in the form of one or more permanent global Securities in definitive, fully registered form (collectively, the “IAI Global Security”); and Initial Securities initially resold pursuant to Regulation S shall be issued initially in the form of one or more temporary global Securities in fully registered form (collectively, the “Temporary Regulation S Global Security”), in each case without interest coupons and with the global securities legend and the applicable restricted securities legend set forth in Exhibit 1 hereto, which shall be deposited on behalf of the purchasers of the Initial Securities represented thereby with the Securities Custodian and registered in the name of the Depository or a nominee of the Depository, duly executed by the Company and authenticated by the Trustee as provided in this Indenture. Except as set forth in this Section 2.1(a), beneficial ownership interests in the Temporary Regulation S Global Security will not be exchangeable for interests in the Rule 144A Global Security, the IAI Global Security, a permanent global Security (the “Permanent Regulation S Global Security”, and together with the Temporary Regulation S Global Security, the “Regulation S Global Security”) or any other Security prior to the expiration of the Distribution Compliance Period and then, after the expiration of the

4

Distribution Compliance Period, may be exchanged for interests in a Rule 144A Global Security, an IAI Global Security or the Permanent Regulation S Global Security only upon certification in form reasonably satisfactory to the Trustee that (i) beneficial ownership interests in such Temporary Regulation S Global Security are owned either by non-U.S. persons or U.S. persons who purchased such interests in a transaction that did not require registration under the Securities Act and (ii) in the case of an exchange for an IAI Global Security, certification that the interest in the Temporary Regulation S Global Security is being transferred to an institutional “accredited investor” under the Securities Act that is an institutional accredited investor acquiring the securities for its own account or for the account of an institutional accredited investor.

          Beneficial interests in Temporary Regulation S Global Securities or IAI Global Securities may be exchanged for interests in Rule 144A Global Securities if (1) such exchange occurs in connection with a transfer of Securities in compliance with Rule 144A and (2) the transferor of the beneficial interest in the Temporary Regulation S Global Security or the IAI Global Security, as applicable, first delivers to the Trustee a written certificate (in a form satisfactory to the Trustee) to the effect that the beneficial interest in the Temporary Regulation S Global Security or the IAI Global Security, as applicable, is being transferred to a Person (a) who the transferor reasonably believes to be a QIB, (b) purchasing for its own account or the account of a QIB in a transaction meeting the requirements of Rule 144A, and (c) in accordance with all applicable securities laws of the States of the United States and other jurisdictions.

          Beneficial interests in Temporary Regulation S Global Securities and Rule 144A Global Securities may be exchanged for an interest in IAI Global Securities if (1) such exchange occurs in connection with a transfer of the securities in compliance with an exemption under the Securities Act and (2) the transferor of the Regulation S Global Security or Rule 144A Global Security, as applicable, first delivers to the trustee a written certificate (substantially in the form of Exhibit 2) to the effect that (A) the Regulation S Global Security or Rule 144A Global Security, as applicable, is being transferred (a) to an “accredited investor” within the meaning of 501(a)(1),(2),(3) and (7) under the Securities Act that is an institutional investor acquiring the securities for its own account or for the account of such an institutional accredited investor, in each case in a minimum principal amount of the securities of $250,000, for investment purposes and not with a view to or for offer or sale in connection with any distribution in violation of the Securities Act and (B) in accordance with all applicable securities laws of the States of the United States and other jurisdictions.

          Beneficial interests in a Rule 144A Global Security or an IAI Global Security may be transferred to a Person who takes delivery in the form of an interest in a Regulation S Global Security, whether before or after the expiration of the Distribution Compliance Period, only if the transferor first delivers to the Trustee a written certificate (in the form provided in the Indenture) to the effect that such transfer is being made in accordance with Rule 903 or 904 of Regulation S or Rule 144 (if applicable).

          The Rule 144A Global Security, the IAI Global Security, the Temporary Regulation S Global Security and the Permanent Regulation S Global Security are

5

collectively referred to herein as “Global Securities”. The aggregate principal amount of the Global Securities may from time to time be increased or decreased by adjustments made on the records of the Trustee and the Depository or its nominee as hereinafter provided.

          (b) Book-Entry Provisions. This Section 2.1(b) shall apply only to a Global Security deposited with or on behalf of the Depository.

          The Company shall execute and the Trustee shall, in accordance with this Section 2.1(b), authenticate and deliver initially one or more Global Securities that (a) shall be registered in the name of the Depository for such Global Security or Global Securities or the nominee of such Depository and (b) shall be delivered by the Trustee to such Depository or pursuant to such Depository’s instructions or held by the Trustee as custodian for the Depository.

          Members of, or participants in, the Depository (“Agent Members”) shall have no rights under this Indenture with respect to any Global Security held on their behalf by the Depository or by the Trustee as the custodian of the Depository or under such Global Security, and the Company, the Trustee and any agent of the Company or the Trustee shall be entitled to treat the Depository as the absolute owner of such Global Security for all purposes whatsoever. Notwithstanding the foregoing, nothing herein shall prevent the Company, the Trustee or any agent of the Company or the Trustee from giving effect to any written certification, proxy or other authorization furnished by the Depository or impair, as between the Depository and its Agent Members, the operation of customary practices of such Depository governing the exercise of the rights of a holder of a beneficial interest in any Global Security.

          (c) Definitive Securities. Except as provided in this Section 2.1 or Section 2.3 or 2.4, owners of beneficial interests in Global Securities shall not be entitled to receive physical delivery of Definitive Securities.

     2.2 Authentication. The Trustee shall authenticate and deliver: (1) on the Issue Date, an aggregate principal amount of $250,000,000 10¹/4% Senior Notes due 2015, (2) any Additional Securities for an original issue in an aggregate principal amount specified in the written order of the Company pursuant to Section 2.02 of the Indenture and (3) Exchange Securities or Private Exchange Securities for issue only in a Registered Exchange Offer or a Private Exchange, respectively, pursuant to a Registration Rights Agreement, for a like principal amount of Initial Securities, in each case upon a written order of the Company signed by at least one Officer. Such order shall specify the amount of the Securities to be authenticated and the date on which the original issue of Securities is to be authenticated and, in the case of any issuance of Additional Securities pursuant to Section 2.13 of the Indenture, shall certify that such issuance is in compliance with Section 4.03 of the Indenture.

6

     2.3 Transfer and Exchange.

          (a) Transfer and Exchange of Definitive Securities. When Definitive Securities are presented to the Registrar with a request:

(x)	to register the transfer of such Definitive Securities; or
(y)	to exchange such Definitive Securities for an equal principal amount of Definitive Securities of other authorized denominations,

the Registrar shall register the transfer or make the exchange as requested if its reasonable requirements for such transaction are met; provided, however, that the Definitive Securities surrendered for transfer or exchange:

     (i) shall be duly endorsed or accompanied by a written instrument of transfer in form reasonably satisfactory to the Company and the Registrar, duly executed by the Holder thereof or its attorney duly authorized in writing; and

     (ii) if such Definitive Securities are required to bear a restricted securities legend, they are being transferred or exchanged pursuant to an effective registration statement under the Securities Act, pursuant to Section 2.3(b) or pursuant to clause (A), (B) or (C) below, and are accompanied by the following additional information and documents, as applicable:

     (A) if such Definitive Securities are being delivered to the Registrar by a Holder for registration in the name of such Holder, without transfer, a certification from such Holder to that effect; or

     (B) if such Definitive Securities are being transferred to the Company, a certification to that effect; or

     (C) if such Definitive Securities are being transferred (x) pursuant to an exemption from registration in accordance with Rule 144A, Regulation S or Rule 144 under the Securities Act; or (y) in reliance upon another exemption from the requirements of the Securities Act: (i) a certification to that effect (in the form set forth on the reverse of the Security) and (ii) if the Company so requests, an opinion of counsel or other evidence reasonably satisfactory to it as to the compliance with the restrictions set forth in the legend set forth in Section 2.3(e)(i).

          (b) Restrictions on Transfer of a Definitive Security for a Beneficial Interest in a Global Security. A Definitive Security may not be exchanged for a beneficial interest in a Rule 144A Global Security, an IAI Global Security or a Permanent Regulation S Global Security except upon satisfaction of the requirements set forth below. Upon receipt by the Trustee of a Definitive Security, duly endorsed or accompanied by appropriate instruments of transfer, in form satisfactory to the Trustee, together with:

7

     (i) certification, in the form set forth on the reverse of the Security, that such Definitive Security is either (A) being transferred to a QIB in accordance with Rule 144A, (B) being transferred to an IAI or (C) being transferred after expiration of the Distribution Compliance Period by a Person who initially purchased such Security in reliance on Regulation S to a buyer who elects to hold its interest in such Security in the form of a beneficial interest in the Permanent Regulation S Global Security; and

     (ii) written instructions directing the Trustee to make, or to direct the Securities Custodian to make, an adjustment on its books and records with respect to such Rule 144A Global Security (in the case of a transfer pursuant to clause (b)(i)(A)), IAI Global Security (in the case of a transfer pursuant to clause (b)(1)(B)) or Permanent Regulation S Global Security (in the case of a transfer pursuant to clause (b)(i)(B)) to reflect an increase in the aggregate principal amount of the Securities represented by the Rule 144A Global Security, IAI Global Security or Permanent Regulation S Global Security, as applicable, such instructions to contain information regarding the Depository account to be credited with such increase,

then the Trustee shall cancel such Definitive Security and cause, or direct the Securities Custodian to cause, in accordance with the standing instructions and procedures existing between the Depository and the Securities Custodian, the aggregate principal amount of Securities represented by the Rule 144A Global Security, IAI Global Security or Permanent Regulation S Global Security, as applicable, to be increased by the aggregate principal amount of the Definitive Security to be exchanged and shall credit or cause to be credited to the account of the Person specified in such instructions a beneficial interest in the Rule 144A Global Security, IAI Global Security or Permanent Regulation S Global Security, as applicable, equal to the principal amount of the Definitive Security so canceled. If no Rule 144A Global Securities, IAI Global Securities or Permanent Regulation S Global Securities, as applicable, are then outstanding, the Company shall issue and the Trustee shall authenticate, upon written order of the Company in the form of an Officers’ Certificate of the Company, a new Rule 144A Global Security, IAI Global Security or Permanent Regulation S Global Security, as applicable, in the appropriate principal amount.

          (c) Transfer and Exchange of Global Securities.

     (i) The transfer and exchange of Global Securities or beneficial interests therein shall be effected through the Depository, in accordance with this Indenture (including applicable restrictions on transfer set forth herein, if any) and the procedures of the Depository therefor. A transferor of a beneficial interest in a Global Security shall deliver to the Registrar a written order given in accordance with the Depository’s procedures containing information regarding the participant account of the Depository to be credited with a beneficial interest in the

8

Global Security. The Registrar shall, in accordance with such instructions instruct the Depository to credit to the account of the Person specified in such instructions a beneficial interest in the Global Security and to debit the account of the Person making the transfer the beneficial interest in the Global Security being transferred.

     (ii) If the proposed transfer is a transfer of a beneficial interest in one Global Security to a beneficial interest in another Global Security, the Registrar shall reflect on its books and records the date and an increase in the principal amount of the Global Security to which such interest is being transferred in an amount equal to the principal amount of the interest to be so transferred, and the Registrar shall reflect on its books and records the date and a corresponding decrease in the principal amount of the Global Security from which such interest is being transferred.

     (iii) Notwithstanding any other provisions of this Appendix (other than the provisions set forth in Section 2.4), a Global Security may not be transferred as a whole except by the Depository to a nominee of the Depository or by a nominee of the Depository to the Depository or another nominee of the Depository or by the Depository or any such nominee to a successor Depository or a nominee of such successor Depository.

     (iv) In the event that Global Security is exchanged for Definitive Securities to Section 2.4 of this Appendix, prior to the consummation of a Registered Exchange Offer or the effectiveness of a Shelf Registration Statement with respect to such Securities, such Securities may be exchanged only in accordance with such procedures as are substantially consistent with the provisions of this Section 2.3 (including the certification requirements set forth on the reverse of the Initial Securities intended to ensure that such transfers comply with Rule 144A, Regulation S or another applicable exemption under the Securities Act, as the case may be) and such other procedures as may from time to time be adopted by the Company.

          (d) Restrictions on Transfer of Temporary Regulation S Global Securities. During the Distribution Compliance Period, beneficial ownership interests in Temporary Regulation S Global Securities may only be sold, pledged or transferred in accordance with the Applicable Procedures and only (i) to the Company, (ii) in an offshore transaction in accordance with Regulation S (other than a transaction resulting in an exchange for an interest in a Permanent Regulation S Global Security), (iii) pursuant to an effective registration statement under the Securities Act, in each case in accordance with any applicable securities laws of any State of the United States.

          (e) Legend.

     (i) Except as permitted by the following paragraphs (ii), (iii) and (iv), each Security certificate evidencing the Global Securities (and all

9

Securities issued in exchange therefor or in substitution thereof), in the case of Securities offered otherwise than in reliance on Regulation S shall bear a legend in substantially the following form:

THIS SECURITY (OR ITS PREDECESSOR) WAS ORIGINALLY ISSUED IN A TRANSACTION EXEMPT FROM REGISTRATION UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND THIS SECURITY MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM. EACH PURCHASER OF THIS SECURITY IS HEREBY NOTIFIED THAT THE SELLER OF THIS SECURITY MAY BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF THE SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER.

THE HOLDER OF THIS SECURITY AGREES FOR THE BENEFIT OF THE COMPANY THAT (A) THIS SECURITY MAY BE OFFERED, RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (I) TO THE COMPANY, (II) IN THE UNITED STATES TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (III) TO AN “ACCREDITED INVESTOR” WITHIN THE MEANING OF RULE 501(A)(1),(2),(3) OR (7) UNDER THE SECURITIES ACT THAT, PRIOR TO SUCH TRANSFER, FURNISHES THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING TO THE TRANSFER OF THIS SECURITY (THE FORM OF WHICH CAN BE OBTAINED FROM THE TRUSTEE) AND, IF SUCH TRANSFER IS IN RESPECT OF AN AGGREGATE PRINCIPAL AMOUNT OF SECURITIES LESS THAN $250,000, AN OPINION OF COUNSEL ACCEPTABLE TO THE COMPANY THAT SUCH TRANSFER IS IN COMPLIANCE WITH THE SECURITIES ACT, (IV) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN ACCORDANCE WITH RULE 904 UNDER THE SECURITIES ACT, (V) PURSUANT TO EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY RULE 144 THEREUNDER (IF AVAILABLE) OR (VI) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT, IN EACH OF CASES (I) THROUGH (VI) IN ACCORDANCE WITH ANY

10

APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES, AND (B) THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER OF THIS SECURITY FROM IT OF THE RESALE RESTRICTIONS REFERRED TO IN (A) ABOVE.

     Each certificate evidencing a Security offered in reliance on Regulation S shall, in addition to the foregoing, bear a legend in substantially the following form:

THIS SECURITY (OR ITS PREDECESSOR) WAS ORIGINALLY ISSUED IN A TRANSACTION ORIGINALLY EXEMPT FROM REGISTRATION UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND MAY NOT BE TRANSFERRED IN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, ANY U.S. PERSON EXCEPT PURSUANT TO AN AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND ALL APPLICABLE STATE SECURITIES LAWS. TERMS USED ABOVE HAVE THE MEANINGS GIVEN TO THEM IN REGULATION S UNDER THE SECURITIES ACT.

     Each Definitive Security shall also bear the following additional legend:

IN CONNECTION WITH ANY TRANSFER, THE HOLDER WILL DELIVER TO THE REGISTRAR AND TRANSFER AGENT SUCH CERTIFICATES AND OTHER INFORMATION AS SUCH TRANSFER AGENT MAY REASONABLY REQUIRE TO CONFIRM THAT THE TRANSFER COMPLIES WITH THE FOREGOING RESTRICTIONS.

     (ii) Upon any sale or transfer of a Transfer Restricted Security (including any Transfer Restricted Security represented by a Global Security) pursuant to Rule 144 under the Securities Act, the Registrar shall permit the transferee thereof to exchange such Transfer Restricted Security for a certificated Security that does not bear the legend set forth above and rescind any restriction on the transfer of such Transfer Restricted Security, if the transferor thereof certifies in writing to the Registrar that such sale or transfer was made in reliance on Rule 144 (such certification to be in the form set forth on the reverse of the Security).

     (iii) After a transfer of any Initial Securities or Private Exchange Securities pursuant to and during the period of the effectiveness of a Shelf Registration Statement with respect to such Initial Securities or Private Exchange Securities, as the case may be, all requirements pertaining to legends on such Initial Security or such Private Exchange

11

Security will cease to apply, the requirements requiring any such Initial Security or such Private Exchange Security issued to certain Holders be issued in global form will cease to apply, and a certificated Initial Security or Private Exchange Security or an Initial Security or Private Exchange Security in global form, in each case without restrictive transfer legends, will be available to the transferee of the Holder of such Initial Securities or Private Exchange Securities upon exchange of such transferring Holder’s certificated Initial Security or Private Exchange Security or directions to transfer such Holder’s interest in the Global Security, as applicable.

     (iv) Upon the consummation of a Registered Exchange Offer with respect to the Initial Securities, all requirements pertaining to such Initial Securities that Initial Securities issued to certain Holders be issued in global form will still apply with respect to Holders of such Initial Securities that do not exchange their Initial Securities, and Exchange Securities in certificated or global form, in each case without the restricted securities legend set forth in Exhibit 1 hereto will be available to Holders that exchange such Initial Securities in such Registered Exchange Offer.

     (v) Upon the consummation of a Private Exchange with respect to the Initial Securities, all requirements pertaining to such Initial Securities that Initial Securities issued to certain Holders be issued in global form will still apply with respect to Holders of such Initial Securities that do not exchange their Initial Securities, and Private Exchange Securities in global form with the global securities legend and the applicable restricted securities legend set forth in Exhibit 1 hereto will be available to Holders that exchange such Initial Securities in such Private Exchange.

          (f) Cancellation or Adjustment of Global Security. At such time as all beneficial interests in a Global Security have either been exchanged for Definitive Securities, redeemed, purchased or canceled, such Global Security shall be returned to the Depository for cancellation or retained and canceled by the Trustee. At any time prior to such cancellation, if any beneficial interest in a Global Security is exchanged for certificated Securities, redeemed, purchased or canceled, the principal amount of Securities represented by such Global Security shall be reduced and an adjustment shall be made on the books and records of the Trustee (if it is then the Securities Custodian for such Global Security) with respect to such Global Security, by the Trustee or the Securities Custodian, to reflect such reduction.

          (g) No Obligation of the Trustee.

     (i) The Trustee shall have no responsibility or obligation to any beneficial owner of a Global Security, a member of, or a participant in the Depository or other Person with respect to the accuracy of the records of the Depository or its nominee or of any participant or member thereof, with respect to any ownership interest in the Securities or with respect to

12

the delivery to any participant, member, beneficial owner or other Person (other than the Depository) of any notice (including any notice of redemption) or the payment of any amount, under or with respect to such Securities. All notices and communications to be given to the Holders and all payments to be made to Holders under the Securities shall be given or made only to or upon the order of the registered Holders (which shall be the Depository or its nominee in the case of a Global Security). The rights of beneficial owners in any Global Security shall be exercised only through the Depository subject to the applicable rules and procedures of the Depository. The Trustee may rely and shall be fully protected in relying upon information furnished by the Depository with respect to its members, participants and any beneficial owners.

     (ii) The Trustee shall have no obligation or duty to monitor, determine or inquire as to compliance with any restrictions on transfer imposed under this Indenture or under applicable law with respect to any transfer of any interest in any Security (including any transfers between or among Depository participants, members or beneficial owners in any Global Security) other than to require delivery of such certificates and other documentation or evidence as are expressly required by, and to do so if and when expressly required by, the terms of this Indenture, and to examine the same to determine substantial compliance as to form with the express requirements hereof.

          2.4 Definitive Securities.

          (a) A Global Security deposited with the Depository or with the Trustee as Securities Custodian for the Depository pursuant to Section 2.1 shall be transferred to the beneficial owners thereof in the form of Definitive Securities in an aggregate principal amount equal to the principal amount of such Global Security, in exchange for such Global Security, only if such transfer complies with Section 2.3 hereof and (i) the Depository notifies the Company that it is unwilling or unable to continue as Depository for such Global Security and the Depository fails to appoint a successor depository or if at any time such Depository ceases to be a “clearing agency” registered under the Exchange Act, in either case, and a successor depository is not appointed by the Company within 90 days of such notice, or (ii) an Event of Default has occurred and is continuing or (iii) the Company, in its sole discretion, notifies the Trustee in writing that it elects to cause the issuance of Definitive Securities under this Indenture.

          (b) Any Global Security that is transferable to the beneficial owners thereof pursuant to this Section 2.4 shall be surrendered by the Depository to the Trustee located at its principal corporate trust office in the Borough of Manhattan, The City of New York, to be so transferred, in whole or from time to time in part, without charge, and the Trustee shall authenticate and deliver, upon such transfer of each portion of such Global Security, an equal aggregate principal amount of Definitive Securities of authorized denominations. Any portion of a Global Security transferred pursuant to this Section 2.4 shall be executed, authenticated and delivered only in denominations of

13

$2,000 principal amount and any integral multiples of $1,000 in excess of $2,000 and registered in such names as the Depository shall direct. Any Definitive Security delivered in exchange for an interest in the Transfer Restricted Security shall, except as otherwise provided by Section 2.3(e) hereof, bear the applicable restricted securities legend and definitive securities legend set forth in Exhibit 1 hereto.

          (c) Subject to the provisions of Section 2.4(b) hereof, the registered Holder of a Global Security shall be entitled to grant proxies and otherwise authorize any Person, including Agent Members and Persons that may hold interests through Agent Members, to take any action which a Holder is entitled to take under this Indenture or the Securities.

          (d) In the event of the occurrence of one of the events specified in Section 2.4(a) hereof, the Company shall promptly make available to the Trustee a reasonable supply of Definitive Securities in definitive, fully registered form without interest coupons. In the event that such Definitive Securities are not issued, the Company expressly acknowledges, with respect to the right of any Holder to pursue a remedy pursuant to Section 6.06 of this Indenture, the right of any beneficial owner of Securities to pursue such remedy with respect to the portion of the Global Security that represents such beneficial owner’s Securities as if such Definitive Securities had been issued.

14

EXHIBIT 1
to RULE 144A/REGULATION S/IAI APPENDIX

[FORM OF FACE OF INITIAL SECURITY]

[Global Securities Legend]

          UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), NEW YORK, NEW YORK, TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO., OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC) ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

          TRANSFERS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN PART, TO NOMINEES OF DTC OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR’S NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN THE INDENTURE REFERRED TO ON THE REVERSE HEREOF.

          [[FOR REGULATION S GLOBAL SECURITY ONLY] UNTIL 40 DAYS AFTER THE LATER OF COMMENCEMENT OR COMPLETION OF THE OFFERING, AN OFFER OR SALE OF SECURITIES WITHIN THE UNITED STATES BY A DEALER (AS DEFINED IN THE SECURITIES ACT) MAY VIOLATE THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT IF SUCH OFFER OR SALE IS MADE OTHERWISE THAN IN ACCORDANCE WITH RULE 144A THEREUNDER.]

[Restricted Securities Legend for Securities offered otherwise than in Reliance on Regulation]

          THIS SECURITY (OR ITS PREDECESSOR) WAS ORIGINALLY ISSUED IN A TRANSACTION EXEMPT FROM REGISTRATION UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND THIS SECURITY MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM. EACH PURCHASER OF THIS SECURITY IS HEREBY NOTIFIED THAT THE SELLER OF THIS SECURITY MAY

15

BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF THE SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER.

          THE HOLDER OF THIS SECURITY AGREES FOR THE BENEFIT OF THE COMPANY THAT (A) THIS SECURITY MAY BE OFFERED, RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (I) TO THE COMPANY, (II) WITHIN THE UNITED STATES TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (III) TO AN “ACCREDITED INVESTOR” WITHIN THE MEANING OF RULE 501(A)(1),(2),(3) OR (7) UNDER THE SECURITIES ACT THAT, PRIOR TO SUCH TRANSFER, FURNISHES THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING TO THE TRANSFER OF THIS SECURITY (THE FORM OF WHICH CAN BE OBTAINED FROM THE TRUSTEE) AND, IF SUCH TRANSFER IS IN RESPECT OF AN AGGREGATE PRINCIPAL AMOUNT OF SECURITIES LESS THAN $250,000, AN OPINION OF COUNSEL ACCEPTABLE TO THE COMPANY THAT SUCH TRANSFER IS IN COMPLIANCE WITH THE SECURITIES ACT, (IV) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN ACCORDANCE WITH RULE 904 UNDER THE SECURITIES ACT, (V) PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY RULE 144 THEREUNDER (IF AVAILABLE) OR (VI) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT, IN EACH OF CASES (I) THROUGH (VI) IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES, AND (B) THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER OF THIS SECURITY FROM IT OF THE RESALE RESTRICTIONS REFERRED TO IN (A) ABOVE.

[Restricted Securities Legend for Securities Offered in Reliance on Regulation S.]

          THIS SECURITY (OR ITS PREDECESSOR) WAS ORIGINALLY ISSUED IN A TRANSACTION ORIGINALLY EXEMPT FROM REGISTRATION UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND MAY NOT BE TRANSFERRED IN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, ANY U.S. PERSON EXCEPT PURSUANT TO AN AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND ALL APPLICABLE STATE SECURITIES LAWS. TERMS USED ABOVE HAVE THE MEANINGS GIVEN TO THEM IN REGULATION S UNDER THE SECURITIES ACT.

[Temporary Regulation S Global Security Legend]

          EXCEPT AS SET FORTH BELOW, BENEFICIAL OWNERSHIP INTERESTS IN THIS TEMPORARY REGULATION S GLOBAL SECURITY WILL NOT BE EXCHANGEABLE FOR INTERESTS IN THE PERMANENT

16

REGULATION S GLOBAL SECURITY OR ANY OTHER SECURITY REPRESENTING AN INTEREST IN THE SECURITIES REPRESENTED HEREBY WHICH DO NOT CONTAIN A LEGEND CONTAINING RESTRICTIONS ON TRANSFER, UNTIL THE EXPIRATION OF THE “40-DAY DISTRIBUTION COMPLIANCE PERIOD” (WITHIN THE MEANING OF RULE 903(b)(2) OF REGULATION S UNDER THE SECURITIES ACT) AND THEN ONLY UPON CERTIFICATION IN FORM REASONABLY SATISFACTORY TO THE TRUSTEE THAT SUCH BENEFICIAL INTERESTS ARE OWNED EITHER BY NON-U.S. PERSONS OR U.S. PERSONS WHO PURCHASED SUCH INTERESTS IN A TRANSACTION THAT DID NOT REQUIRE REGISTRATION UNDER THE SECURITIES ACT. DURING SUCH 40-DAY DISTRIBUTION COMPLIANCE PERIOD, BENEFICIAL OWNERSHIP INTERESTS IN THIS TEMPORARY REGULATION S GLOBAL SECURITY MAY ONLY BE SOLD, PLEDGED OR TRANSFERRED (I) TO THE COMPANY, (II) OUTSIDE THE UNITED STATES IN A TRANSACTION IN ACCORDANCE WITH RULE 904 OF REGULATION S UNDER THE SECURITIES ACT, (III) IN ACCORDANCE WITH RULE 144A UNDER THE SECURITIES ACT, OR (IV) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT, IN EACH OF CASES (I) THROUGH (III) IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES. HOLDERS OF INTERESTS IN THIS TEMPORARY REGULATION S GLOBAL SECURITY WILL NOTIFY ANY PURCHASER OF THIS SECURITY OF THE RESALE RESTRICTIONS REFERRED TO ABOVE, IF THEN APPLICABLE.

          BENEFICIAL INTERESTS IN THIS TEMPORARY REGULATION S GLOBAL SECURITY MAY BE EXCHANGED FOR INTERESTS IN A RULE 144A GLOBAL SECURITY, WHETHER BEFORE OR AFTER THE EXPIRATION OF THE 40-DAY DISTRIBUTION COMPLIANCE PERIOD, ONLY IF (1) SUCH EXCHANGE OCCURS IN CONNECTION WITH A TRANSFER OF THE SECURITIES IN COMPLIANCE WITH RULE 144A AND (2) THE TRANSFEROR OF THE REGULATION S GLOBAL SECURITY FIRST DELIVERS TO THE TRUSTEE A WRITTEN CERTIFICATE (IN THE FORM ATTACHED TO THIS CERTIFICATE) TO THE EFFECT THAT THE REGULATION S GLOBAL SECURITY IS BEING TRANSFERRED (A) TO A PERSON WHO THE TRANSFEROR REASONABLY BELIEVES TO BE A QUALIFIED INSTITUTIONAL BUYER WITHIN THE MEANING OF RULE 144A, (B) TO A PERSON WHO IS PURCHASING FOR ITS OWN ACCOUNT OR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, AND (C) IN ACCORDANCE WITH ALL APPLICABLE SECURITIES LAWS OF THE STATES OF THE UNITED STATES AND OTHER JURISDICTIONS.

          AFTER THE EXPIRATION OF THE DISTRIBUTION COMPLIANCE PERIOD, BENEFICIAL INTERESTS IN THIS TEMPORARY REGULATION S GLOBAL SECURITY MAY BE EXCHANGED FOR INTERESTS IN AN IAI GLOBAL SECURITY ONLY IF (1) SUCH EXCHANGE OCCURS IN CONNECTION WITH A TRANSFER OF THE SECURITIES IN COMPLIANCE WITH AN EXEMPTION UNDER THE SECURITIES ACT AND (2) THE TRANSFEROR OF

17

THE REGULATION S GLOBAL SECURITY FIRST DELIVERS TO THE TRUSTEE A WRITTEN CERTIFICATE (IN THE FORM ATTACHED TO THIS CERTIFICATE) TO THE EFFECT THAT THE REGULATION S GLOBAL SECURITY IS BEING TRANSFERRED (A) TO AN “ACCREDITED INVESTOR” WITHIN THE MEANING OF RULE 501(A)(1),(2),(3) OR (7) UNDER THE SECURITIES ACT THAT, PRIOR TO SUCH TRANSFER, FURNISHES THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING TO THE TRANSFER OF THIS SECURITY (THE FORM OF WHICH CAN BE OBTAINED FROM THE TRUSTEE) AND, IF SUCH TRANSFER IS IN RESPECT OF AN AGGREGATE PRINCIPAL AMOUNT OF SECURITIES LESS THAN $250,000, AN OPINION OF COUNSEL ACCEPTABLE TO THE COMPANY THAT SUCH TRANSFER IS IN COMPLIANCE WITH THE SECURITIES ACT AND (B) IN ACCORDANCE WITH ALL APPLICABLE SECURITIES LAWS OF THE STATES OF THE UNITED STATES AND OTHER JURISDICTIONS.

          BENEFICIAL INTERESTS IN A RULE 144A GLOBAL SECURITY OR AN IAI GLOBAL SECURITY MAY BE TRANSFERRED TO A PERSON WHO TAKES DELIVERY IN THE FORM OF AN INTEREST IN THE REGULATION S GLOBAL SECURITY, WHETHER BEFORE OR AFTER THE EXPIRATION OF THE 40-DAY DISTRIBUTION COMPLIANCE PERIOD, ONLY IF THE TRANSFEROR FIRST DELIVERS TO THE TRUSTEE A WRITTEN CERTIFICATE (IN THE FORM ATTACHED TO THIS CERTIFICATE) TO THE EFFECT THAT SUCH TRANSFER IS BEING MADE IN ACCORDANCE WITH RULE 903 OR 904 OF REGULATION S OR RULE 144 (IF AVAILABLE).

[Definitive Securities Legend]

          IN CONNECTION WITH ANY TRANSFER, THE HOLDER WILL DELIVER TO THE REGISTRAR AND TRANSFER AGENT SUCH CERTIFICATES AND OTHER INFORMATION AS SUCH TRANSFER AGENT MAY REASONABLY REQUIRE TO CONFIRM THAT THE TRANSFER COMPLIES WITH THE FOREGOING RESTRICTIONS.

18

No.                      $                    

10¹/4% Senior Notes due 2015

          Alion Science and Technology Corporation, a Delaware corporation, promises to pay to ________________________, or registered assigns, the principal sum of _____________________ Dollars on February 1, 2015.

          Interest Payment Dates: February 1 and August 1, commencing on August 1, 2007.

          Record Dates: January 15 and July 15.

          Additional provisions of this Security are set forth on the other side of this Security.

Dated:

ALION SCIENCE AND TECHNOLOGY CORPORATION,
By:
	Name:
	Title:

TRUSTEE’S CERTIFICATE OF
AUTHENTICATION

WILMINGTON TRUST COMPANY as Trustee, certifies that this is one of the Securities referred to in the Indenture.
By
	Authorized Signatory

19

[FORM OF REVERSE SIDE OF INITIAL SECURITY]

10¹/4% SENIOR NOTE DUE 2015

1. Interest

          Alion Science and Technology Corporation, a Delaware corporation (such corporation, and its successors and assigns under the Indenture hereinafter referred to, being herein called the “Company”), promises to pay interest on the principal amount of this Security at the rate per annum shown above; provided, however, that if a Registration Default (as defined in the Registration Rights Agreement) occurs, additional interest will accrue on this Security (i) so long as the Company is subject to, and complies, subject to Rule 12b-25 of the Exchange Act, with, the periodic reporting requirements of the Exchange Act, at a rate of 0.25% per annum for the first 90-day period immediately following the occurrence of a Registration Default, and such rate will increase by an additional 0.25% per annum with respect to each subsequent 90-day period until all Registration Defaults have been cured, up to a maximum additional interest rate of 1.00% per annum and (ii) otherwise, at a rate of 0.50% per annum for the first 90-day period immediately following the occurrence of a Registration Default, and such rate will increase by an additional 0.50% per annum with respect to each subsequent 90-day period until all Registration Defaults have been cured, up to a maximum additional interest rate of 2.00% per annum, in each case from and including the date on which any such Registration Default shall occur to but excluding the date on which all Registration Defaults have been cured. The Company will pay interest semiannually in arrears on February 1 and August 1 of each year, commencing August 1, 2007. Interest on the Securities will accrue from the most recent date to which interest has been paid or, if no interest has been paid, from February 8, 2007. Interest will be computed on the basis of a 360-day year of twelve 30-day months. The Company will pay interest on overdue principal at the rate borne by this Security plus 1.00% per annum, and it will pay interest on overdue installments of interest at the same rate to the extent lawful.

2. Method of Payment

          The Company will pay interest on the Securities (except defaulted interest) to the Persons who are registered holders of Securities at the close of business on the January 15 or July 15 next preceding the interest payment date even if Securities are canceled after the record date and on or before the interest payment date. Holders must surrender Securities to a Paying Agent to collect principal payments. The Company will pay principal and interest in money of the United States that at the time of payment is legal tender for payment of public and private debts. Payments in respect of the Securities represented by a Global Security (including principal, premium and interest) will be made by wire transfer of immediately available funds to the accounts specified by the Depository. The Company will make all payments in respect of a certificated Security (including principal, premium and interest) by mailing a check to the registered address of each Holder thereof; provided, however, that payments on a certificated Security will be made by wire transfer to a U.S. dollar account maintained by the payee with a bank in the United States if such Holder elects payment by wire transfer by giving

20

written notice to the Trustee or the Paying Agent to such effect designating such account no later than 30 days immediately preceding the relevant due date for payment (or such other date as the Trustee may accept in its discretion).

3. Paying Agent and Registrar

          Initially, Wilmington Trust Company, a Delaware banking corporation (the “Trustee”), will act as Paying Agent and Registrar. The Company may appoint and change any Paying Agent, Registrar or co-registrar without notice. The Company or any of its domestically incorporated Wholly Owned Subsidiaries may act as Paying Agent, Registrar or co-registrar.

4. Indenture

          The Company issued the Securities under an Indenture dated as of February 8, 2007 (“Indenture”), among the Company, the Subsidiary Guarantors and the Trustee. The terms of the Securities include those stated in the Indenture and those made part of the Indenture by reference to the Trust Indenture Act of 1939 (15 U.S.C. §§ 77aaa-77bbbb) (the “Act”). Terms defined in the Indenture and not defined herein have the meanings ascribed thereto in the Indenture. The Securities are subject to all such terms, and Securityholders are referred to the Indenture and the Act for a statement of those terms.

          The Securities are general unsecured obligations of the Company. The Company shall be entitled, subject to its compliance with Section 4.03 of the Indenture, to issue Additional Securities pursuant to Section 2.13 of the Indenture. The Initial Securities issued on the Issue Date, any Additional Securities and all Exchange Securities or Private Exchange Securities issued in exchange therefor will be treated as a single class for all purposes under the Indenture. The Indenture contains certain covenants that limit the ability of the Company and its Restricted Subsidiaries to Incur additional Indebtedness; pay dividends or distributions on, or redeem or repurchase Capital Stock; make Investments; issue or sell Capital Stock of Restricted Subsidiaries; engage in transactions with Affiliates; create certain Liens on assets; transfer or sell assets; Guarantee Indebtedness; restrict dividends or other payments of Restricted Subsidiaries; consolidate, merge or transfer all or substantially all of its assets and the assets of its Restricted Subsidiaries; and engage in sale/ leaseback transactions. These covenants are subject to important exceptions and qualifications.

5. Optional Redemption

          Except as set forth below, the Company shall not be entitled to redeem the Securities.

          On and after February 1, 2011, the Company shall be entitled at its option to redeem all or a portion of the Securities upon not less than 30 nor more than 60 days’ notice, at the redemption prices set forth below (expressed in percentages of principal amount on the redemption date), plus accrued interest to the redemption date (subject to the right of Holders of record on the relevant record date to receive interest due on the

21

relevant interest payment date), if redeemed during the 12-month period commencing on February 1 of the years set forth below:

Period	Redemption Price
2011		105.125	%
2012		102.563	%
2013 and thereafter		100.000	%

          In addition, at any time prior to February 1, 2010, the Company shall be entitled at its option on one or more occasions to redeem Securities (which includes Additional Securities, if any) in an aggregate principal amount not to exceed 35% of the aggregate principal amount of the Securities (which includes Additional Securities, if any) originally issued at a redemption price (expressed as a percentage of principal amount) of 110.25%, plus accrued and unpaid interest to the redemption date, with the Net Cash Proceeds from one or more Qualified Equity Offerings; provided, however, that (1) at least 65% of such aggregate principal amount of Securities (which includes Additional Securities, if any) remains outstanding immediately after the occurrence of each such redemption (other than Securities held, directly or indirectly, by the Company or its Affiliates); and (2) each such redemption occurs within 90 days after the date of the related Qualified Equity Offering.

          Prior to February 1, 2011, the Company shall be entitled at its option to redeem all, but not less than all, of the Securities at a redemption price equal to 100% of the principal amount of the Securities plus the Applicable Premium as of, and accrued and unpaid interest to, the redemption date (subject to the right of Holders on the relevant record date to receive interest due on the relevant interest payment date).

6. Notice of Redemption

          Notice of redemption will be mailed at least 30 days but not more than 60 days before the redemption date to each Holder of Securities to be redeemed at his registered address. Securities in denominations larger than $2,000 principal amount may be redeemed in part but only in whole multiples of $1,000. If money sufficient to pay the redemption price of and accrued interest on all Securities (or portions thereof) to be redeemed on the redemption date is deposited with the Paying Agent on or before the redemption date and certain other conditions set forth in the Indenture are satisfied, on and after such date interest ceases to accrue on such Securities (or such portions thereof) called for redemption.

7. Put Provisions

          Upon a Change of Control, any Holder of Securities will have the right to cause the Company to repurchase all or any part of the Securities of such Holder at a repurchase price equal to 101% of the principal amount of the Securities to be repurchased plus accrued interest to the date of repurchase (subject to the right of Holders

22

of record on the relevant record date to receive interest due on the related interest payment date) as provided in, and subject to the terms of, the Indenture.

8. Guaranty

          The payment by the Company of the principal of, and premium and interest on, the Securities is fully and unconditionally guaranteed on a joint and several senior basis by each of the Subsidiary Guarantors to the extent set forth in the Indenture.

9. Denominations; Transfer; Exchange

          The Securities are in registered form without coupons in denominations of $2,000 principal amount and whole multiples of $1,000. A Holder may transfer or exchange Securities in accordance with the Indenture and the restrictions set forth in the Securities. The Registrar may require a Holder, among other things, to furnish appropriate endorsements or transfer documents and to pay any taxes and fees required by law or permitted by the Indenture. The Registrar need not register the transfer of or exchange any Securities selected for redemption (except, in the case of a Security to be redeemed in part, the portion of the Security not to be redeemed) or any Securities for a period of 15 days before a selection of Securities to be redeemed or 15 days before an interest payment date.

10. Persons Deemed Owners

          The registered Holder of this Security may be treated as the owner of it for all purposes.

11. Unclaimed Money

          If money for the payment of principal or interest remains unclaimed for two years, the Trustee or Paying Agent shall pay the money back to the Company at its request unless applicable abandoned property law designates another Person. After any such payment, Holders entitled to the money must look only to the Company and not to the Trustee for payment.

12. Discharge and Defeasance

          Subject to certain conditions, the Company at any time shall be entitled to terminate some or all of its obligations and the obligations of the Subsidiary Guarantors under the Securities and the Indenture if the Company deposits with the Trustee money or U.S. Government Obligations for the payment of principal and interest on the Securities to redemption or maturity, as the case may be.

13. Amendment, Waiver

          Subject to certain exceptions set forth in the Indenture, (a) the Indenture and the Securities may be amended with the written consent of the Holders of at least a majority in principal amount outstanding of the Securities and (b) any default or

23

noncompliance with any provision may be waived with the written consent of the Holders of a majority in principal amount outstanding of the Securities. Subject to certain exceptions set forth in the Indenture, without the consent of any Securityholder, the Company, the Subsidiary Guarantors and the Trustee shall be entitled to amend the Indenture or the Securities to cure any ambiguity, omission, defect or inconsistency, or to comply with Article 5 of the Indenture, or to provide for uncertificated Securities in addition to or in place of certificated Securities, or to add guarantees with respect to the Securities, including Subsidiary Guaranties, or to secure the Securities, or to add additional covenants or surrender rights and powers conferred on the Company or the Subsidiary Guarantors, or to comply with any requirement of the SEC in connection with qualifying the Indenture under the Act, or to make any change that does not adversely affect the rights of any Securityholder, or to conform the text of the Indenture or the Securities to any provision of the “Description of the Notes” Section of the Confidential Offering Circular of the Company dated January 26, 2007, to the extent that such provision in such Section was intended to be a verbatim recitation of a provision of the Indenture, the Securities, or the Subsidiary Guarantees or to make amendments to provisions of the Indenture relating to the form, authentication, transfer and legending of the Securities, or to evidence and provide for the acceptance and appointment of a successor Trustee.

14. Defaults and Remedies

          Under the Indenture, Events of Default include (a) default for 30 days in payment of interest on the Securities; (b) default in payment of principal on the Securities at maturity, upon redemption pursuant to paragraph 5 of the Securities, upon acceleration or otherwise, or failure by the Company to redeem or purchase Securities when required; (c) failure by the Company or any Subsidiary Guarantor to comply with other agreements in the Indenture or the Securities, in certain cases subject to notice and lapse of time; (d) certain accelerations (including failure to pay within any grace period after final maturity) of other Indebtedness of the Company, any Subsidiary Guarantor or any Significant Subsidiary if the amount accelerated (or so unpaid) exceeds $30,000,000; (e) certain events of bankruptcy or insolvency with respect to the Company, the Subsidiary Guarantors and the Significant Subsidiaries; and (f) certain judgments or decrees for the payment of money in excess of $30,000,000. If an Event of Default occurs and is continuing, the Trustee or the Holders of at least 25% in principal amount of the Securities may declare all the Securities to be due and payable immediately. Certain events of bankruptcy or insolvency are Events of Default which will result in the Securities being due and payable immediately upon the occurrence of such Events of Default.

          Securityholders may not enforce the Indenture or the Securities except as provided in the Indenture. The Trustee may refuse to enforce the Indenture or the Securities unless it receives indemnity or security satisfactory to it. Subject to certain limitations, Holders of a majority in principal amount of the Securities may direct the Trustee in its exercise of any trust or power. The Trustee may withhold from Securityholders notice of any continuing Default (except a Default in payment of

24

principal or interest) if it determines that withholding notice is in the interest of the Holders.

15. Trustee Dealings with the Company

          Subject to certain limitations imposed by the Act, the Trustee under the Indenture, in its individual or any other capacity, may become the owner or pledgee of Securities and may otherwise deal with and collect obligations owed to it by the Company or its Affiliates and may otherwise deal with the Company or its Affiliates with the same rights it would have if it were not Trustee.

16. No Recourse Against Others

          A director, officer, employee, incorporator or stockholder, as such, of the Company, any Subsidiary Guarantor or the Trustee shall not have any liability for any obligations of the Company under the Securities or the Indenture or for any claim based on, in respect of or by reason of such obligations or their creation. By accepting a Security, each Securityholder waives and releases all such liability. The waiver and release are part of the consideration for the issue of the Securities.

17. Authentication

          This Security shall not be valid until an authorized signatory of the Trustee (or an authenticating agent) manually signs the certificate of authentication on the other side of this Security.

18. Abbreviations

          Customary abbreviations may be used in the name of a Securityholder or an assignee, such as TEN COM (=tenants in common), TEN ENT (=tenants by the entireties), JT TEN (=joint tenants with rights of survivorship and not as tenants in common), CUST (=custodian), and U/G/M/A (=Uniform Gift to Minors Act).

19. CUSIP Numbers

          Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures the Company has caused CUSIP numbers to be printed on the Securities and has directed the Trustee to use CUSIP numbers in notices of redemption as a convenience to Securityholders. No representation is made as to the accuracy of such numbers either as printed on the Securities or as contained in any notice of redemption and reliance may be placed only on the other identification numbers placed thereon.

20. Holders’ Compliance with Registration Rights Agreement.

          Each Holder of a Security, by acceptance hereof, acknowledges and agrees to the provisions of the Registration Rights Agreement, including the obligations of the

25

Holders with respect to a registration and the indemnification of the Company to the extent provided therein.

21. Governing Law.

          THIS SECURITY SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

          The Company will furnish to any Securityholder upon written request and without charge to the Securityholder a copy of the Indenture which has in it the text of this Security in larger type. Requests may be made to:

Alion Science and Technology
1750 Tysons Boulevard
Suite 1300
McLean, VA 22102

Attention: James Fontana, Esq.
                  General Counsel

26

ASSIGNMENT FORM

To assign this Security, fill in the form below:

I or we assign and transfer this Security to

     (Print or type assignee’s name, address and zip code)

     (Insert assignee’s soc. sec. or tax I.D. No.)

     and irrevocably appoint                                          agent to transfer this Security on the books of the Company. The agent may substitute another to act for him.

Date: Your Signature:

Sign exactly as your name appears on the other side of this Security.

In connection with any transfer of any of the Securities evidenced by this certificate occurring prior to the expiration of the period referred to in Rule 144(k) under the Securities Act after the later of the date of original issuance of such Securities and the last date, if any, on which such Securities were owned by the Company or any Affiliate of the Company, the undersigned confirms that such Securities are being transferred in accordance with its terms:

CHECK ONE BOX BELOW

     to the Company; or

(1)   o	pursuant to an effective registration statement under the Securities Act of 1933; or
(2)   o	inside the United States to a “qualified institutional buyer” (as defined in Rule 144A under the Securities Act of 1933) that purchases for its own account or for the account of a qualified institutional buyer to whom notice is given that such transfer is being made in reliance on Rule 144A, in each case pursuant to and in compliance with Rule 144A under the Securities Act of 1933; or

27

(3)   o	outside the United States in an offshore transaction within the meaning of Regulation S under the Securities Act in compliance with Rule 904 under the Securities Act of 1933; or
(4)   o	pursuant to the exemption from registration provided by Rule 144 under the Securities Act of 1933; or
(5)   o	to an institutional “accredited investor” (as defined in Rule 501(a)(1),(2),(3) or (7) under the Securities Act of 1933) that has furnished to the Trustee a signed letter containing certain representations and agreements.

Unless one of the boxes is checked, the Trustee will refuse to register any of the Securities evidenced by this certificate in the name of any person other than the registered holder thereof; provided, however, that if box (4) is checked, the Trustee shall be entitled to require, prior to registering any such transfer of the Securities, such legal opinions, certifications and other information as the Company has reasonably requested to confirm that such transfer is being made pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act of 1933, such as the exemption provided by Rule 144 under such Act.

	Signature
Signature Guarantee:
Signature must be guaranteed	Signature

     Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the Registrar, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Registrar in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended.

28

TO BE COMPLETED BY PURCHASER IF (2) ABOVE IS CHECKED.

          The undersigned represents and warrants that it is purchasing this Security for its own account or an account with respect to which it exercises sole investment discretion and that it and any such account is a “qualified institutional buyer” within the meaning of Rule 144A under the Securities Act of 1933, and is aware that the sale to it is being made in reliance on Rule 144A and acknowledges that it has received such information regarding the Company as the undersigned has requested pursuant to Rule 144A or has determined not to request such information and that it is aware that the transferor is relying upon the undersigned’s foregoing representations in order to claim the exemption from registration provided by Rule 144A.

Dated:                                            Notice: To be executed by an executive officer

29

[TO BE ATTACHED TO GLOBAL SECURITIES]

SCHEDULE OF INCREASES OR DECREASES IN GLOBAL SECURITY

     The following increases or decreases in this Global Security have been made:

			Principal
			amount of this
		Amount of	Global	Signature of
	Amount of decrease	increase in	Security	authorized officer
	in Principal amount	Principal amount of	following such	of Trustee or
Date of	of this Global	this Global	decrease or	Securities
Exchange	Security	Security	increase)	Custodian

30

OPTION OF HOLDER TO ELECT PURCHASE

          If you want to elect to have this Security purchased by the Company pursuant to Section 4.06 or 4.09 of the Indenture, check the box: o

          If you want to elect to have only part of this Security purchased by the Company pursuant to Section 4.06 or 4.09 of the Indenture, state the amount in principal amount: $                    

Dated:	Your Signature:
		(Sign exactly as your name appears on the other side of this Security.)

Signature Guarantee:
	(Signature must be guaranteed)

     Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the Registrar, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Registrar in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended.

EXHIBIT A

[FORM OF FACE OF EXCHANGE SECURITY
OR PRIVATE EXCHANGE SECURITY]*/**/

*/

[If the Security is to be issued in global form add the Global Securities Legend from Exhibit 1 to Appendix A and the attachment from such Exhibit 1 captioned “[TO BE ATTACHED TO GLOBAL SECURITIES] — SCHEDULE OF INCREASES OR DECREASES IN GLOBAL SECURITY”.] [Note: Include asterisk and this note if a 144A Offering with registration rights]

**/

[If the Security is a Private Exchange Security issued in a Private Exchange to an Initial Purchaser holding an unsold portion of its initial allotment, add the Restricted Securities Legend from Exhibit 1 to Appendix A and replace the Assignment Form included in this Exhibit A with the Assignment Form included in such Exhibit 1.] [Note: Include asterisk and this note if a 144A Offering with registration rights.]

2

No.            $                    

10¹/4% Senior Notes due 2015

          Alion Science and Technology Corporation, a Delaware corporation, promises to pay to _________________, or registered assigns, the principal sum of __________________ Dollars on February 1, 2015.

          Interest Payment Dates: February 1 and August 1, commencing on August 1, 2007.

          Record Dates: January 15 and July 15.

          Additional provisions of this Security are set forth on the other side of this Security.

Dated:

ALION SCIENCE AND TECHNOLOGY CORPORATION,
By:
	Name:
	Title:

TRUSTEE’S CERTIFICATE OF AUTHENTICATION WILMINGTON TRUST COMPANY as Trustee, certifies that this is one of the Securities referred to in the Indenture.
By
	Authorized Signatory

3

[FORM OF REVERSE SIDE OF [EXCHANGE] SECURITY
[OR PRIVATE EXCHANGE SECURITY]]

10¹/4% Senior Note due 2015

1. Interest

          Alion Science and Technology Corporation, a Delaware corporation (such corporation, and its successors and assigns under the Indenture hereinafter referred to, being herein called the “Company”), promises to pay interest on the principal amount of this Security at the rate per annum shown above[; provided, however, that if a Registration Default (as defined in the Registration Rights Agreement) occurs, additional interest will accrue on this Security (i) so long as the Company is subject to, and complies, subject to Rule 12b-25 of the Exchange Act, with, the periodic reporting requirements of the Exchange Act, at a rate of 0.25% per annum for the first 90-day period immediately following the occurrence of a Registration Default, and such rate will increase by an additional 0.25% per annum with respect to each subsequent 90-day period until all Registration Defaults have been cured, up to a maximum additional interest rate of 1.00% per annum and (ii) otherwise, at a rate of 0.50% per annum for the first 90-day period immediately following the occurrence of a Registration Default, and such rate will increase by an additional 0.50% per annum with respect to each subsequent 90-day period until all Registration Defaults have been cured, up to a maximum additional interest rate of 2.00% per annum, in each case from and including the date on which any such Registration Default shall occur to but excluding the date on which all Registration Defaults have been cured]. The Company will pay interest semiannually in arrears on February 1 and August 1 of each year, commencing August 1, 2007. Interest on the Securities will accrue from the most recent date to which interest has been paid or, if no interest has been paid, from February 8, 2007. Interest will be computed on the basis of a 360-day year of twelve 30-day months. The Company will pay interest on overdue principal at the rate borne by this Security plus 1.00% per annum, and it will pay interest on overdue installments of interest at the same rate to the extent lawful.

2. Method of Payment

          The Company will pay interest on the Securities (except defaulted interest) to the Persons who are registered holders of Securities at the close of business on the January 15 or July 15 next preceding the interest payment date even if Securities are canceled after the record date and on or before the interest payment date. Holders must surrender Securities to a Paying Agent to collect principal payments. The Company will pay principal and interest in money of the United States that at the time of payment is legal tender for payment of public and private debts. Payments in respect of the Securities represented by a Global Security (including principal, premium and interest) will be made by wire transfer of immediately available funds to the accounts specified by the Depository. The Company will make all payments in respect of a certificated Security (including principal, premium and interest) by mailing a check to the registered

4

address of each Holder thereof; provided, however, that payments on a certificated Security will be made by wire transfer to a U.S. dollar account maintained by the payee with a bank in the United States if such Holder elects payment by wire transfer by giving written notice to the Trustee or the Paying Agent to such effect designating such account no later than 30 days immediately preceding the relevant due date for payment (or such other date as the Trustee may accept in its discretion).

3. Paying Agent and Registrar

          Initially, Wilmington Trust Company, a Delaware banking corporation (the “Trustee”), will act as Paying Agent and Registrar. The Company may appoint and change any Paying Agent, Registrar or co-registrar without notice. The Company or any of its domestically incorporated Wholly Owned Subsidiaries may act as Paying Agent, Registrar or co-registrar.

4. Indenture

          The Company issued the Securities under an Indenture dated as of February 8, 2007 (“Indenture”), among the Company, the Subsidiary Guarantors and the Trustee. The terms of the Securities include those stated in the Indenture and those made part of the Indenture by reference to the Trust Indenture Act of 1939 (15 U.S.C. §§ 77aaa-77bbbb) (the “Act”). Terms defined in the Indenture and not defined herein have the meanings ascribed thereto in the Indenture. The Securities are subject to all such terms, and Securityholders are referred to the Indenture and the Act for a statement of those terms.

          The Securities are general unsecured obligations of the Company. The Company shall be entitled, subject to its compliance with Section 4.03 of the Indenture, to issue Additional Securities pursuant to Section 2.13 of the Indenture. The Initial Securities issued on the Issue Date, any Additional Securities and all Exchange Securities or Private Exchange Securities issued in exchange therefor will be treated as a single class for all purposes under the Indenture. The Indenture contains certain covenants that limit the ability of the Company and its Restricted Subsidiaries to Incur additional Indebtedness; pay dividends or distributions on, or redeem or repurchase Capital Stock; make Investments; issue or sell Capital Stock of Restricted Subsidiaries; engage in transactions with Affiliates; create certain Liens on assets; transfer or sell assets; Guarantee Indebtedness; restrict dividends or other payments of Restricted Subsidiaries; consolidate, merge or transfer all or substantially all of its assets and the assets of its Restricted Subsidiaries; and engage in sale/ leaseback transactions. These covenants are subject to important exceptions and qualifications.

5. Optional Redemption

          Except as set forth below, the Company shall not be entitled to redeem the Securities.

          On and after February 1, 2011, the Company shall be entitled at its option to redeem all or a portion of the Securities upon not less than 30 nor more than 60 days’

5

notice, at the redemption prices set forth below (expressed in percentages of principal amount on the redemption date), plus accrued interest to the redemption date (subject to the right of Holders of record on the relevant record date to receive interest due on the relevant interest payment date), if redeemed during the 12-month period commencing on February 1 of the years set forth below:

	Redemption
Period	Price
2011		105.125	%
2012		102.563	%
2013 and thereafter		100.000	%

          In addition, at any time prior to February 1, 2010, the Company shall be entitled at its option on one or more occasions to redeem Securities (which includes Additional Securities, if any) in an aggregate principal amount not to exceed 35% of the aggregate principal amount of the Securities (which includes Additional Securities, if any) originally issued at a redemption price (expressed as a percentage of principal amount) of 110.25%, plus accrued and unpaid interest to the redemption date, with the Net Cash Proceeds from one or more Qualified Equity Offerings; provided, however, that (1) at least 65% of such aggregate principal amount of Securities (which includes Additional Securities, if any) remains outstanding immediately after the occurrence of each such redemption (other than Securities held, directly or indirectly, by the Company or its Affiliates); and (2) each such redemption occurs within 90 days after the date of the related Qualified Equity Offering.

          Prior to February 1, 2011, the Company shall be entitled at its option to redeem all, but not less than all, of the Securities at a redemption price equal to 100% of the principal amount of the Securities plus the Applicable Premium as of, and accrued and unpaid interest to, the redemption date (subject to the right of Holders on the relevant record date to receive interest due on the relevant interest payment date).

6. Notice of Redemption

          Notice of redemption will be mailed at least 30 days but not more than 60 days before the redemption date to each Holder of Securities to be redeemed at his registered address. Securities in denominations larger than $2,000 principal amount may be redeemed in part but only in whole multiples of $1,000. If money sufficient to pay the redemption price of and accrued interest on all Securities (or portions thereof) to be redeemed on the redemption date is deposited with the Paying Agent on or before the redemption date and certain other conditions set forth in the Indenture are satisfied, on and after such date interest ceases to accrue on such Securities (or such portions thereof) called for redemption.

7. Put Provisions

          Upon a Change of Control, any Holder of Securities will have the right to cause the Company to repurchase all or any part of the Securities of such Holder at a

6

repurchase price equal to 101% of the principal amount of the Securities to be repurchased plus accrued interest to the date of repurchase (subject to the right of Holders of record on the relevant record date to receive interest due on the related interest payment date) as provided in, and subject to the terms of, the Indenture.

8. Guaranty

          The payment by the Company of the principal of, and premium and interest on, the Securities is fully and unconditionally guaranteed on a joint and several senior basis by each of the Subsidiary Guarantors to the extent set forth in the Indenture.

9. Denominations; Transfer; Exchange

          The Securities are in registered form without coupons in denominations of $2,000 principal amount and whole multiples of $1,000. A Holder may transfer or exchange Securities in accordance with the Indenture and the restrictions set forth in the Securities. The Registrar may require a Holder, among other things, to furnish appropriate endorsements or transfer documents and to pay any taxes and fees required by law or permitted by the Indenture. The Registrar need not register the transfer of or exchange any Securities selected for redemption (except, in the case of a Security to be redeemed in part, the portion of the Security not to be redeemed) or any Securities for a period of 15 days before a selection of Securities to be redeemed or 15 days before an interest payment date.

10. Persons Deemed Owners

          The registered Holder of this Security may be treated as the owner of it for all purposes.

11. Unclaimed Money

          If money for the payment of principal or interest remains unclaimed for two years, the Trustee or Paying Agent shall pay the money back to the Company at its request unless applicable abandoned property law designates another Person. After any such payment, Holders entitled to the money must look only to the Company and not to the Trustee for payment.

12. Discharge and Defeasance

          Subject to certain conditions, the Company at any time shall be entitled to terminate some or all of its obligations and the obligations of the Subsidiary Guarantors under the Securities and the Indenture if the Company deposits with the Trustee money or U.S. Government Obligations for the payment of principal and interest on the Securities to redemption or maturity, as the case may be.

7

13. Amendment, Waiver

          Subject to certain exceptions set forth in the Indenture, (a) the Indenture and the Securities may be amended with the written consent of the Holders of at least a majority in principal amount outstanding of the Securities and (b) any default or noncompliance with any provision may be waived with the written consent of the Holders of a majority in principal amount outstanding of the Securities. Subject to certain exceptions set forth in the Indenture, without the consent of any Securityholder, the Company, the Subsidiary Guarantors and the Trustee shall be entitled to amend the Indenture or the Securities to cure any ambiguity, omission, defect or inconsistency, or to comply with Article 5 of the Indenture, or to provide for uncertificated Securities in addition to or in place of certificated Securities, or to add guarantees with respect to the Securities, including Subsidiary Guaranties, or to secure the Securities, or to add additional covenants or surrender rights and powers conferred on the Company or the Subsidiary Guarantors, or to comply with any requirement of the SEC in connection with qualifying the Indenture under the Act, or to make any change that does not adversely affect the rights of any Securityholder, or to conform the text of the Indenture or the Securities to any provision of the “Description of the Notes” Section of the Confidential Offering Circular of the Company dated January 26, 2007, to the extent that such provision in such Section was intended to be a verbatim recitation of a provision of the Indenture, the Securities or the Subsidiary Guaranties or to make amendments to provisions of the Indenture relating to the form, authentication, transfer and legending of the Securities, or to evidence and provide for the acceptance and appointment of a successor Trustee.

14. Defaults and Remedies

          Under the Indenture, Events of Default include (a) default for 30 days in payment of interest on the Securities; (b) default in payment of principal on the Securities at maturity, upon redemption pursuant to paragraph 5 of the Securities, upon acceleration or otherwise, or failure by the Company to redeem or purchase Securities when required; (c) failure by the Company or any Subsidiary Guarantor to comply with other agreements in the Indenture or the Securities, in certain cases subject to notice and lapse of time; (d) certain accelerations (including failure to pay within any grace period after final maturity) of other Indebtedness of the Company, any Subsidiary Guarantor or any Significant Subsidiary if the amount accelerated (or so unpaid) exceeds $30,000,000; (e) certain events of bankruptcy or insolvency with respect to the Company, the Subsidiary Guarantors and the Significant Subsidiaries; and (f) certain judgments or decrees for the payment of money in excess of $30,000,000. If an Event of Default occurs and is continuing, the Trustee or the Holders of at least 25% in principal amount of the Securities may declare all the Securities to be due and payable immediately. Certain events of bankruptcy or insolvency are Events of Default which will result in the Securities being due and payable immediately upon the occurrence of such Events of Default.

          Securityholders may not enforce the Indenture or the Securities except as provided in the Indenture. The Trustee may refuse to enforce the Indenture or the

8

Securities unless it receives indemnity or security satisfactory to it. Subject to certain limitations, Holders of a majority in principal amount of the Securities may direct the Trustee in its exercise of any trust or power. The Trustee may withhold from Securityholders notice of any continuing Default (except a Default in payment of principal or interest) if it determines that withholding notice is in the interest of the Holders.

15. Trustee Dealings with the Company

          Subject to certain limitations imposed by the Act, the Trustee under the Indenture, in its individual or any other capacity, may become the owner or pledgee of Securities and may otherwise deal with and collect obligations owed to it by the Company or its Affiliates and may otherwise deal with the Company or its Affiliates with the same rights it would have if it were not Trustee.

16. No Recourse Against Others

          A director, officer, employee, incorporator or stockholder, as such, of the Company, any Subsidiary Guarantor or the Trustee shall not have any liability for any obligations of the Company under the Securities or the Indenture or for any claim based on, in respect of or by reason of such obligations or their creation. By accepting a Security, each Securityholder waives and releases all such liability. The waiver and release are part of the consideration for the issue of the Securities.

17. Authentication

          This Security shall not be valid until an authorized signatory of the Trustee (or an authenticating agent) manually signs the certificate of authentication on the other side of this Security.

18. Abbreviations

          Customary abbreviations may be used in the name of a Securityholder or an assignee, such as TEN COM (=tenants in common), TEN ENT (=tenants by the entireties), JT TEN (=joint tenants with rights of survivorship and not as tenants in common), CUST (=custodian), and U/G/M/A (=Uniform Gift to Minors Act).

19. CUSIP Numbers

          Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures the Company has caused CUSIP numbers to be printed on the Securities and has directed the Trustee to use CUSIP numbers in notices of redemption as a convenience to Securityholders. No representation is made as to the accuracy of such numbers either as printed on the Securities or as contained in any notice of redemption and reliance may be placed only on the other identification numbers placed thereon.

9

20. [Holders’ Compliance with Registration Rights Agreement.

          Each Holder of a Security, by acceptance hereof, acknowledges and agrees to the provisions of the Registration Rights Agreement, including the obligations of the Holders with respect to a registration and the indemnification of the Company to the extent provided therein.]¹

21. Governing Law.

          THIS SECURITY SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

          The Company will furnish to any Securityholder upon written request and without charge to the Securityholder a copy of the Indenture which has in it the text of this Security in larger type. Requests may be made to:

Alion Science and Technology
1750 Tysons Boulevard
Suite 1300
McLean, VA 22102

Attention: James Fontana, Esq.
                   General Counsel

¹ Provision may not be necessary if the Exchange Offer is completed on a timely basis.

10

ASSIGNMENT FORM

To assign this Security, fill in the form below:

I or we assign and transfer this Security to

     (Print or type assignee’s name, address and zip code)

     (Insert assignee’s soc. sec. or tax I.D. No.)

and irrevocably appoint                     agent to transfer this Security on the books of the Company. The agent may substitute another to act for him.

Date: Your Signature:

Sign exactly as your name appears on the other side of this Security.

OPTION OF HOLDER TO ELECT PURCHASE

          If you want to elect to have this Security purchased by the Company pursuant to Section 4.06 or 4.09 of the Indenture, check the box: o

          If you want to elect to have only part of this Security purchased by the Company pursuant to Section 4.06 or 4.09 of the Indenture, state the amount in principal amount: $                    

Dated:	Your Signature:
		(Sign exactly as your name appears on the other side of this Security.)

Signature Guarantee:
	(Signature must be guaranteed)

Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the Registrar, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Registrar in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended.

EXHIBIT 2 to Rule 144A/REGULATION S/IAI APPENDIX

Form of
Transferee Letter of Representation

Alion Science and Technology Corporation
1750 Tysons Boulevard
Suite 1300
McLean, VA 22102

In care of
o
o
o

Ladies and Gentlemen:

          This certificate is delivered to request a transfer of $[ ] principal amount of the 10¹/4% Senior Notes due 2015 (the “Securities”) of Alion Science and Technology Corporation (the “Company”).

          Upon transfer, the Securities would be registered in the name of the new beneficial owner as follows:

Name:

Address:

Taxpayer ID Number:

          The undersigned represents and warrants to you that:

          1. We are an institutional “accredited investor” (as defined in Rule 501(a)(1), (2), (3) or (7) under the Securities Act of 1933, as amended (the “Securities Act”)), purchasing for our own account or for the account of such an institutional “accredited investor” at least $250,000 principal amount of the Securities, and we are acquiring the Securities not with a view to, or for offer or sale in connection with, any distribution in violation of the Securities Act. We have such knowledge and experience in financial and business matters as to be capable of evaluating the merits and risks of our investment in the Securities, and we invest in or purchase securities similar to the Securities in the normal course of our business. We, and any accounts for which we are acting, are each able to bear the economic risk of our or its investment.

2

          2. We understand that the Securities have not been registered under the Securities Act and, unless so registered, may not be sold except as permitted in the following sentence. We agree on our own behalf and on behalf of any investor account for which we are purchasing Securities to offer, sell or otherwise transfer such Securities prior to the date that is two years after the later of the date of original issue and the last date on which the Company or any affiliate of the Company was the owner of such Securities (or any predecessor thereto) (the “Resale Restriction Termination Date”) only (i) to the Company, (ii) in the United States to a person whom the seller reasonably believes is a qualified institutional buyer in a transaction meeting the requirements of Rule 144A, (iii) to an institutional “accredited investor” within the meaning of Rule 501(a)(1), (2), (3) or (7) under the Securities Act that is an institutional accredited investor purchasing for its own account or for the account of an institutional accredited investor, in each case in a minimum principal amount of the Securities of $250,000, (iv) outside the United States in a transaction complying with the provisions of Rule 904 under the Securities Act, (v) pursuant to an exemption from registration under the Securities Act provided by Rule 144 (if available) or (vi) pursuant to an effective registration statement under the Securities Act, in each of cases (i) through (vi) subject to any requirement of law that the disposition of our property or the property of such investor account or accounts be at all times within our or their control and in compliance with any applicable state securities laws. The foregoing restrictions on resale will not apply subsequent to the Resale Restriction Termination Date. If any resale or other transfer of the Securities is proposed to be made pursuant to clause (iii) above prior to the Resale Restriction Termination Date, the transferor shall deliver a letter from the transferee substantially in the form of this letter to the Company and the Trustee, which shall provide, among other things, that the transferee is an institutional “accredited investor” within the meaning of Rule 501(a)(1), (2), (3) or (7) under the Securities Act and that it is acquiring such Securities for investment purposes and not for distribution in violation of the Securities Act. Each purchaser acknowledges that the Company and the Trustee reserve the right prior to the offer, sale or other transfer prior to the Resale Restriction Termination Date of the Securities pursuant to clause (iii), (iv) or (v) above to require the delivery of an opinion of counsel, certifications or other information satisfactory to the Company and the Trustee.

TRANSFEREE: ,

by:

EX-4.16

exv4w16

EX-10.82

Exhibit 10.82

EXECUTION COPY

$250,000,000

ALION SCIENCE AND TECHNOLOGY CORPORATION

10.25% Senior Notes due 2015

PURCHASE AGREEMENT

January 26, 2007

Credit Suisse Securities (USA) LLC (“Credit Suisse”),
     Eleven Madison Avenue,
          New York, N.Y. 10010-3629

Dear Sirs:

     1. Introductory. Alion Science and Technology Corporation, a Delaware corporation (the “Company”), proposes, subject to the terms and conditions stated herein, to issue and sell to Credit Suisse Securities (USA) LLC (the initial “Purchaser”) U.S. $250,000,000 principal amount of its 10.25% Senior Notes due 2015 (“Offered Securities”) to be issued under an indenture dated February 8, 2007 (the “Indenture”), among the Company, the Guarantors (as defined below) and Wilmington Trust Company, as Trustee. The United States Securities Act of 1933, as amended, is herein referred to as the “Securities Act.”

     The Offered Securities will be guaranteed, on a senior and unsecured basis, jointly and severally by those subsidiaries of the Company listed in the attached Schedule B hereto (the “Guarantors”).

     The holders of the Offered Securities will be entitled to the benefits of a Registration Rights Agreement of even date herewith among the Company, the Guarantors and the Purchaser (the “Registration Rights Agreement”), pursuant to which the Company agrees to file a registration statement with the Securities Exchange Commission (the “Commission”) registering an exchange offer for, or, in certain circumstances, the resale of, the Offered Securities under the Securities Act.

     The Company and the Guarantors, jointly and severally, hereby agree with the Purchaser as follows:

     2. Representations and Warranties of the Company and the Guarantors. The Company and the Guarantors jointly and severally represent and warrant to, and agree with, the Purchaser that:

     (a) A preliminary offering circular (the “Preliminary Offering Circular”) relating to the Offered Securities to be offered by the Purchaser and a final offering circular (the “Final Offering Circular”) disclosing the offering price and other final terms of the Offered Securities and dated the date of this Agreement (even if finalized and issued subsequent to the date of this Agreement) have been or will be prepared by the Company. “General Disclosure Package” means the Preliminary Offering Circular, together with any Issuer Free Writing Communication (as hereinafter defined) existing at the Applicable Time (as hereinafter defined) and the

information which is intended for general distribution to prospective investors, as evidenced by its being specified in Schedule A to this Agreement (including the term sheet listing the final terms of the Offered Securities and their offering, included in Schedule D to this Agreement, which is referred to as the “Terms Communication”). “Applicable Time” means 11:55 a.m. (EDT time) on the date of this Agreement. As of the date of this Agreement, the Final Offering Circular does not include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. At the Applicable Time neither (i) the General Disclosure Package, nor (ii) any individual Supplemental Marketing Material (as hereinafter defined), when considered together with the General Disclosure Package, included any untrue statement of a material fact or omitted to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. The preceding two sentences do not apply to statements in or omissions from the Preliminary or Final Offering Circular, the General Disclosure Package or any Supplemental Marketing Material based upon written information furnished to the Company by the Purchaser specifically for use therein, it being understood and agreed that the only such information is that described as such in Section 8(b) hereof. Except as disclosed in the General Disclosure Package, on the date of this Agreement, the Company’s Annual Report on Form 10-K most recently filed with the Securities and Exchange Commission (the “Commission”) and all subsequent reports (collectively, the “Exchange Act Reports”) which have been filed by the Company with the Commission or sent to stockholders pursuant to the Securities Exchange Act of 1934 (the “Exchange Act”) do not include any untrue statement of a material fact or omit to state any material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading. Except as disclosed on Schedule 2(a), such documents, when they were filed with the Commission, conformed in all material respects to the requirements of the Exchange Act and the rules and regulations of the Commission thereunder.

“Free Writing Communication” means a written communication (as such term is defined in Rule 405 under the Securities Act) that constitutes an offer to sell or a solicitation of an offer to buy the Offered Securities and is made by means other than the Preliminary Offering Circular or the Final Offering Circular. “Issuer Free Writing Communication” means a Free Writing Communication prepared by or on behalf of the Company, used or referred to by the Company or containing a description of the final terms of the Offered Securities or of their offering, in the form retained in the Company’s records. “Supplemental Marketing Material” means any Issuer Free Writing Communication other than any Issuer Free Writing Communication specified in Schedule E to this Agreement.

     (b) The Company has been duly incorporated and is an existing corporation in good standing under the laws of the State of Delaware, with power and authority (corporate and other) to own its properties and conduct its business as described in the General Disclosure Package; and the Company is duly qualified to do business as a foreign corporation in good standing in all other material jurisdictions in which its ownership or lease of property or the conduct of its business requires such qualification.

     (c) The entities listed on Schedule F to this Agreement are the only direct or indirect subsidiaries and joint ventures of the Company. Schedule F sets forth the jurisdiction of organization of each such subsidiary or joint venture. Each subsidiary of the Company has been duly incorporated and is an existing corporation in good standing under the laws of the jurisdiction of its incorporation, with power and authority (corporate and other) to own its properties and conduct its business as described in the General Disclosure Package; and each subsidiary of the Company is duly qualified to do business as a foreign corporation in good standing in all other material jurisdictions in which its ownership or lease of property or the conduct of its business requires such qualification; all of the issued and outstanding capital stock

2

of each subsidiary of the Company has been duly authorized and validly issued and is fully paid and nonassessable; and the capital stock of each subsidiary owned by the Company, directly or through subsidiaries, is owned free from liens, encumbrances and defects, except for liens and encumbrances granted in connection with the Guaranty and Collateral Agreement entered into by the Company in connection with the Company’s Term B Senior Credit Facility (as hereinafter defined). For purposes of this Agreement, “Term B Senior Credit Facility” means that certain credit agreement dated as of August 2, 2004, as amended, among the Company, certain subsidiaries of the company guaranteeing the Company’s obligations thereunder, the lenders party thereto and Credit Suisse (formerly known as Credit Suisse First Boston), as administrative agent and as collateral agent for such lenders. For purposes of this Agreement, “Guaranty and Collateral Agreement” means the Guarantee and Collateral Agreement dated as of August 2, 2004, as amended, among the Company, certain of its subsidiaries guaranteeing the Company’s obligations under the Term B Senior Credit Facility and Credit Suisse (formerly known as Credit Suisse First Boston), as collateral agent.

     (d) The Indenture has been duly authorized by the Company and each of the Guarantors; the Offered Securities have been duly authorized by the Company; and when the Offered Securities are delivered and paid for pursuant to this Agreement on the Closing Date (as defined below), the Indenture will have been duly executed and delivered, such Offered Securities will have been duly executed, authenticated, issued and delivered, will be consistent with the information in the General Disclosure Package and will conform to the description thereof contained in the Final Offering Circular and the Indenture will constitute a valid and legally binding obligation of the Company and the Guarantors and such Offered Securities will constitute a valid and legally binding obligation of the Company, in each case enforceable in accordance with their terms, subject to bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and similar laws of general applicability relating to or affecting creditors’ rights and to general equity principles.

     (e) Except as disclosed in the General Disclosure Package, there are no contracts, agreements or understandings between the Company and any person that would give rise to a valid claim against the Company or any Purchaser for a brokerage commission, finder’s fee or other like payment.

     (f) No consent, approval, authorization, or order of, or filing with, any governmental agency or body or any court is required for the consummation of the transactions contemplated by this Agreement or the Registration Rights Agreement in connection with the issuance and sale of the Offered Securities by the Company except for the Exchange Offer Registration Statement, the Shelf Registration Statement, if required, the order of the Commission declaring effective the Exchange Offer Registration Statement or, if required, the Shelf Registration Statement (each as defined in the Registration Rights Agreement) and any necessary state securities filings.

     (g) The execution, delivery and performance of the Indenture, this Agreement and the Registration Rights Agreement, and the issuance and sale of the Offered Securities and compliance with the terms and provisions thereof will not result in a breach or violation of any of the terms and provisions of, or constitute a default under, any statute, any rule, regulation or order of any governmental agency or body or any court, domestic or foreign, having jurisdiction over the Company or any subsidiary of the Company or any of their properties, or any agreement or instrument to which the Company or any such subsidiary is a party or by which the Company or any such subsidiary is bound or to which any of the properties of the Company or any such subsidiary is subject, or the charter or by-laws of the Company or any such subsidiary, and the Company has full power and authority to authorize, issue and sell the Offered Securities as contemplated by this Agreement.

3

     (h) This Agreement and the Registration Rights Agreement have been duly authorized, executed and delivered by the Company and the Guarantors.

     (i) Except as disclosed in the General Disclosure Package, the Company and its subsidiaries have good and marketable title to all real properties and all other properties and assets owned by them, in each case free from liens, encumbrances and defects that would materially affect the value thereof or materially interfere with the use made or to be made thereof by them; and except as disclosed in the General Disclosure Package, the Company and its subsidiaries hold any leased real or personal property under valid and enforceable leases with no exceptions that would materially interfere with the use made or to be made thereof by them.

     (j) The Company and its subsidiaries possess adequate certificates, authorities or permits issued by appropriate governmental agencies or bodies necessary to conduct the business now operated by them and have not received any notice of proceedings relating to the revocation or modification of any such certificate, authority or permit that, if determined adversely to the Company or any of its subsidiaries, would individually or in the aggregate have a material adverse effect on the condition (financial or other), business, properties or results of operations of the Company and its subsidiaries taken as a whole (“Material Adverse Effect”).

     (k) No labor dispute with the employees of the Company or any subsidiary exists or, to the knowledge of the Company, is imminent that might have a Material Adverse Effect.

     (l) The Company and its subsidiaries own, possess or can acquire on reasonable terms, adequate trademarks, trade names and other rights to inventions, know-how, patents, copyrights, confidential information and other intellectual property (collectively, “intellectual property rights”) necessary to conduct the business now operated by them, or presently employed by them, and have not received any notice of infringement of or conflict with asserted rights of others with respect to any intellectual property rights that, if determined adversely to the Company or any of its subsidiaries, would individually or in the aggregate have a Material Adverse Effect.

     (m) Except as disclosed in the General Disclosure Package, neither the Company nor any of its subsidiaries is in violation of any statute, any rule, regulation, decision or order of any governmental agency or body or any court, domestic or foreign, relating to the use, disposal or release of hazardous or toxic substances or relating to the protection or restoration of the environment or human exposure to hazardous or toxic substances (collectively, “environmental laws”), owns or operates any real property contaminated with any substance that is subject to any environmental laws, is liable for any off-site disposal or contamination pursuant to any environmental laws, or is subject to any claim relating to any environmental laws, which violation, contamination, liability or claim would individually or in the aggregate have a Material Adverse Effect; and the Company is not aware of any pending investigation which might lead to such a claim.

     (n) Except as disclosed in the General Disclosure Package, there are no pending actions, suits or proceedings against or affecting the Company, any of its subsidiaries or any of their respective properties that, if determined adversely to the Company or any of its subsidiaries, would individually or in the aggregate have a Material Adverse Effect, or would materially and adversely affect the ability of the Company to perform its obligations under the Indenture, this Agreement, the Registration Rights Agreement, or which are otherwise material in the context of the sale of the Offered Securities; and no such actions, suits or proceedings are threatened or, to the Company’s knowledge, contemplated.

4

     (o) The financial statements included in the General Disclosure Package present fairly in all material respects the financial position of the Company and its consolidated subsidiaries as of the dates shown and their results of operations and cash flows for the periods shown, and, except as otherwise disclosed in the General Disclosure Package, such financial statements have been prepared in conformity with the generally accepted accounting principles in the United States applied on a consistent basis; and the assumptions used in preparing the pro forma financial statements included in the General Disclosure Package provide a reasonable basis for presenting the significant effects directly attributable to the transactions or events described therein, the related pro forma adjustments give appropriate effect to those assumptions, and the pro forma columns therein reflect the proper application of those adjustments to the corresponding historical financial statement amounts.

     (p) Except as disclosed in the General Disclosure Package, since the date of the latest audited financial statements included in the General Disclosure Package there has been no material adverse change, nor any development or event involving a prospective material adverse change, in the condition (financial or other), business, properties or results of operations of the Company and its subsidiaries taken as a whole, and, except as disclosed in or contemplated by the General Disclosure Package, there has been no dividend or distribution of any kind declared, paid or made by the Company on any class of its capital stock.

     (q) The Company is subject to the reporting requirements of either Section 13 or Section 15(d) of the Securities Exchange Act of 1934 and files reports with the Commission on the Electronic Data Gathering, Analysis, and Retrieval (EDGAR) system.

     (r) Neither the Company nor any of the Guarantors is an open-end investment company, unit investment trust or face-amount certificate company that is or is required to be registered under Section 8 of the United States Investment Company Act of 1940 (the “Investment Company Act”) ; and the Company is not and, after giving effect to the offering and sale of the Offered Securities and the application of the proceeds thereof as described in the General Disclosure Package, will not be an “investment company” as defined in the Investment Company Act.

     (s) No securities of the same class (within the meaning of Rule 144A(d)(3) under the Securities Act) as the Offered Securities are listed on any national securities exchange registered under Section 6 of the Exchange Act or quoted in a U.S. automated inter-dealer quotation system.

     (t) The offer and sale of the Offered Securities in the manner contemplated by this Agreement will be exempt from the registration requirements of the Securities Act by reason of Section 4(2) thereof and Regulation S thereunder, and it is not necessary to qualify an indenture in respect of the Offered Securities under the United States Trust Indenture Act of 1939, as amended (the “Trust Indenture Act”).

     (u) Neither the Company, nor any of its affiliates, nor any person acting on its or their behalf (i) has, within the six-month period prior to the date hereof, offered or sold in the United States or to any U.S. person (as such terms are defined in Regulation S under the Securities Act) the Offered Securities or any security of the same class or series as the Offered Securities or (ii) has offered or will offer or sell the Offered Securities (A) in the United States by means of any form of general solicitation or general advertising within the meaning of Rule 502(c) under the Securities Act or (B) with respect to any such securities sold in reliance on Rule 903 of Regulation S (“Regulation S”) under the Securities Act, by means of any directed selling efforts within the meaning of Rule 902(c) of Regulation S. The Company, its affiliates and any person acting on its or their behalf have complied and will comply with the offering restrictions

5

requirement of Regulation S. The Company has not entered and will not enter into any contractual arrangement with respect to the distribution of the Offered Securities except for this Agreement, the Indenture and the Registration Rights Agreement.

     (v) The sale of the Offered Securities pursuant to Regulation S is not part of a plan or scheme to evade the registration provisions of the Securities Act.

     (w) The Alion Science and Technology Corporation Employee Ownership, Savings and Investment Trust (the “ESOT”) has been duly organized and is a validly existing trust. Except as disclosed in the General Disclosure Package, each of the ESOP Plan Documents (as defined herein) is in full force and effect and no term or condition thereof has been amended, modified or waived from the terms and conditions contained in the ESOP Plan Documents delivered to the Purchaser, except to the extent such amendment, modification or waiver could not reasonably be anticipated to have a material adverse effect upon the Purchaser or otherwise have a Material Adverse Effect. The ESOT has performed and complied with all the material terms, provisions, agreements and conditions set forth therein and required to be performed or complied with by the ESOT, and no unmatured default, default or breach of any covenant by any such party exists thereunder.

     (x) The Company has provided the Purchaser with a complete and true copy of each of the documents pursuant to which the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan (the “ESOP”) and the ESOT are maintained by the Company, or which concern the Company’s obligations with respect to the ESOP and ESOT, which are listed in the attached Schedule C hereto, and are referred to herein as the “ESOP Plan Documents.” The Company has not subsequently amended or in any other way modified or replaced such ESOP Plan Documents in any material manner without the prior written consent of the Purchaser, except for any amendment, modification or replacement required by the Internal Revenue Service or by applicable law (and the Company shall use its best efforts to deliver a copy of any such amendment, modification or replacement to the Purchaser prior to the execution thereof).

     (y) None of the assets of the Company constitute, for any purpose of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), or Section 4975 of the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”), assets of the ESOP or any other “plan” as defined in Section 3(3) of ERISA or Section 4975 of the Internal Revenue Code.

     (z) No non-exempt prohibited transaction described in Section 406 of ERISA or Section 4975 of the Internal Revenue Code has occurred with respect to the ESOP, and none of the Offered Securities, the Indenture or this Agreement hereunder constitutes or shall constitute or give rise to any such non-exempt prohibited transaction.

     (aa) The ESOP is qualified under Section 401(a) of the Internal Revenue Code, and the ESOP includes two components, one of which is an employee stock ownership plan as defined in Section 4975(e)(7) of the Internal Revenue Code, and the other is a profit sharing plan that includes a cash or deferred compensation arrangement under Section 401(k) of the Internal Revenue Code.

     (bb) To the Company’s knowledge, neither of the Offered Securities nor the Indenture is (for any purpose of Section 406 of ERISA or Section 4975 of the Internal Revenue Code) a direct or indirect loan or other transaction between the Purchaser, any such persons to whom the Purchaser may resell the Offered Securities (“Repurchasers”) and the ESOT which, if it is assumed that the Purchaser or Repurchasers are “parties in interest” and “disqualified persons”

6

(as defined in Section 3(14) of ERISA and Section 4975 of the Internal Revenue Code), is a non-exempt prohibited transaction described in Section 406 of ERISA or Section 4975 of the Internal Revenue Code.

     (cc) Neither the Company nor any of its subsidiaries is or shall be subject to the tax imposed by Section 4978 of the Internal Revenue Code with respect to any “disposition” by the ESOT of any shares of equity interests of the Company.

     (dd) There is no investigation or review by any Governmental Authority, or action, suit, proceeding or arbitration, pending or concluded, concerning any matter with respect to the ESOP or the ESOT relevant as to whether any representation set forth herein is inaccurate or breached (other than in respect of (i) periodic requests to the IRS to issue a favorable determination letter to the effect that the ESOP is and continues to be a qualified plan and an employee stock ownership plan, (ii) Annual Reports (IRS Form 5500 Series) for the ESOP, (iii) routine claims for ESOP benefits and (iv) routine audits of contributions to the ESOP), and neither the ESOP fiduciary nor, to the best of the Company’s knowledge, the ESOT trustee has made any assertion with respect to the ESOP or the ESOT contrary to or inconsistent with the accuracy of any such representation which assertion could reasonably be expected to have a Material Adverse Effect.

     (ee) Neither the ESOP fiduciary nor the ESOT trustee has made any assertion with respect to the ESOP or the ESOT contrary to or inconsistent with the accuracy of any representation or warranty set forth herein that could reasonably be expected to result in a Material Adverse Event.

     3. Purchase, Sale and Delivery of Offered Securities. On the basis of the representations, warranties and agreements and subject to the terms and conditions set forth herein, the Company agrees to sell to the Purchaser, and the Purchaser agrees to purchase from the Company, at a purchase price of 97.50% of the principal amount thereof plus accrued interest from February 8, 2007, to the Closing Date (as hereinafter defined), $250,000,000 principal amount of the Offered Securities.

     The Company will deliver against payment of the purchase price the Offered Securities in the form of one or more permanent global securities in definitive form (the “Global Securities”) deposited with the Trustee as custodian for The Depository Trust Company (“DTC”) and registered in the name of Cede & Co., as nominee for DTC. Interests in any permanent Global Securities will be held only in book-entry form through DTC, except in the limited circumstances described in the Final Offering Circular. Payment for the Offered Securities shall be made by the Purchaser in Federal (same day) funds by official check or checks or wire transfer to an account at a bank acceptable to the Purchaser drawn to the order of the Company at the office of Baker & McKenzie LLP at 10:00 A.M. (New York time), on February 8, 2007, or at such other time not later than seven full business days thereafter that the Purchaser and the Company determine, such time being herein referred to as the “Closing Date”, against delivery to the Trustee as custodian for DTC of the Global Securities representing all of the Securities. The Global Securities will be made available for checking at the above office at least 24 hours prior to the Closing Date.

     4. Representations by Purchaser; Resale by Purchaser. (a) The Purchaser represents and warrants to the Company that it is an “accredited investor” within the meaning of Regulation D under the Securities Act.

     (b) The Purchaser acknowledges that the Offered Securities have not been registered under the Securities Act and may not be offered or sold within the United States or to, or for the account or benefit of, U.S. persons except in accordance with Regulation S or pursuant to an exemption from the registration requirements of the Securities Act. The Purchaser represents

7

and agrees that it has offered and sold the Offered Securities, and will offer and sell the Offered Securities (i) as part of its distribution at any time and (ii) otherwise until 40 days after the later of the commencement of the offering and the Closing Date, only in accordance with Rule 903 or Rule 144A under the Securities Act (“Rule 144A”). Accordingly, neither the Purchaser, nor its affiliates, nor any persons acting on its or their behalf, have engaged or will engage in any directed selling efforts with respect to the Offered Securities, and the Purchaser, its affiliates and all persons acting on its or their behalf have complied and will comply with the offering restrictions requirement of Regulation S. The Purchaser agrees that, at or prior to confirmation of sale of the Offered Securities, other than a sale pursuant to Rule 144A, the Purchaser will have sent to each distributor, dealer or person receiving a selling concession, fee or other remuneration that purchases the Offered Securities from it during the restricted period a confirmation or notice to substantially the following effect:

“The Securities covered hereby have not been registered under the U.S. Securities Act of 1933, as amended (the “Securities Act”) and may not be offered or sold within the United States or to, or for the account or benefit of, U.S. persons (i) as part of their distribution at any time or (ii) otherwise until 40 days after the later of the date of the commencement of the offering and the closing date, except in either case in accordance with Regulation S (or Rule 144A if available) under the Securities Act. Terms used above have the meanings given to them by Regulation S.”

Terms used in this subsection (b) have the meanings given to them by Regulation S.

     (c) The Purchaser agrees that it and each of its affiliates have not entered and will not enter into any contractual arrangement with respect to the distribution of the Offered Securities except with the prior written consent of the Company.

     (d) The Purchaser agrees that it and each of its affiliates will not offer or sell the Offered Securities in the United States by means of any form of general solicitation or general advertising within the meaning of Rule 502(c) under the Securities Act, including, but not limited to (i) any advertisement, article, notice or other communication published in any newspaper, magazine or similar media or broadcast over television or radio, or (ii) any seminar or meeting whose attendees have been invited by any general solicitation or general advertising. The Purchaser agrees, with respect to resales made in reliance on Rule 144A of any of the Offered Securities, to deliver either with the confirmation of such resale or otherwise prior to settlement of such resale a notice to the effect that the resale of such Offered Securities has been made in reliance upon the exemption from the registration requirements of the Securities Act provided by Rule 144A.

     (e) The Purchaser represents and agrees that (i) it has not offered or sold and prior to the expiry of a period of six months from the closing date, will not offer or sell any Offered Securities to persons in the United Kingdom except to persons whose ordinary activities involve them in acquiring, holding, managing or disposing of investments (as principal or agent) for the purposes of their businesses or otherwise in circumstances which have not resulted and will not result in an offer to the public in the United Kingdom within the meaning of the Public Offers of Securities Regulations 1995; (ii) it has only communicated or caused to be communicated and will only communicate or cause to be communicated any invitation or inducement to engage in investment activity (within the meaning of section 21 of the Financial Services and Markets Act 2000 (the “FSMA”)) received by it in connection with the issue or sale of any Offered Securities in circumstances in which section 21(1) of the FSMA does not apply to the Company or the Guarantors; and (iii) it has complied and will comply with all applicable provisions of the FSMA

8

with respect to anything done by it in relation to the Offered Securities in, from or otherwise involving the United Kingdom

     5. Certain Agreements of the Company. The Company agrees with the Purchaser that:

     (a) The Company will advise the Purchaser promptly of any proposal to amend or supplement the Preliminary or Final Offering Circular and will not effect such amendment or supplementation without the Purchaser’s consent, such consent not to be unreasonably withheld or delayed. If, at any time prior to the completion of the resale of the Offered Securities by the Purchaser, there occurs an event or development as a result of which any document included in the Preliminary or Final Offering Circular, the General Disclosure Package or any Supplemental Marketing Material included or would include an untrue statement of a material fact or omitted or would omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances prevailing at such time, not misleading, or if it is necessary at any such time to amend or supplement the Preliminary or Final Offering Circular, the General Disclosure Package or any Supplemental Marketing Material to comply with any applicable law, the Company promptly will notify the Purchaser of such event and promptly will prepare, at its own expense, an amendment or supplement which will correct such statement or omission or effect such compliance. Neither the Purchaser’s consent to, nor its delivery to offerees or investors of, any such amendment or supplement shall constitute a waiver of any of the conditions set forth in Section 6. The first sentence of this subsection does not apply to statements in or omissions from any document in the Preliminary or Final Offering Circular, the General Disclosure Package or any Supplemental Marketing Material made in reliance upon and in conformity with written information furnished to the Company by the Purchaser specifically for use therein, it being understood and agreed that the only such information is that described as such in Section 8(b) hereof.

     (b) The Company will furnish to the Purchaser copies of the Preliminary Offering Circular, each other document comprising a part of the General Disclosure Package, the Final Offering Circular, all amendments and supplements to such documents and each item of Supplemental Marketing Material, in each case as soon as available and in such quantities as the Purchaser reasonably requests, and the Company will furnish to the Purchaser on the date hereof three copies of each of the foregoing documents signed by a duly authorized officer of the Company, one of which in the case of the Preliminary Offering Circular and Final Offering Circular will include the independent accountants’ reports manually signed (or signed by facsimile to be followed up with a manual signature if requested after the Closing by Purchaser) by such independent accountants. At any time when the Company is not subject to Section 13 or 15(d) of the Exchange Act, the Company will promptly furnish or cause to be furnished to the Purchaser and, upon request of holders and prospective purchasers of the Offered Securities, to such holders and purchasers, copies of the information required to be delivered to holders and prospective purchasers of the Offered Securities pursuant to Rule 144A(d)(4) under the Securities Act (or any successor provision thereto) in order to permit compliance with Rule 144A in connection with resales by such holders of the Offered Securities. The Company will pay the expenses of printing and distributing to the Purchaser all such documents.

     (c) The Company will arrange for the qualification of the Offered Securities for sale and the determination of their eligibility for investment under the laws of such jurisdictions in the United States and Canada as the Purchaser designates and will continue such qualifications in effect so long as required for the resale of the Offered Securities by the Purchaser, provided that the Company will not be required to qualify as a foreign corporation or to file a general consent to service of process in any such state.

9

     (d) During the period of two years after the Closing Date, the Company will, upon request, furnish to the Purchaser and any holder of Offered Securities a copy of the restrictions on transfer applicable to the Offered Securities.

     (e) During the period of two years after the Closing Date, the Company will not, and will not permit any of its affiliates (as defined in Rule 144 under the Securities Act) to, resell any of the Offered Securities that have been reacquired by any of them.

     (f) During the period of two years after the Closing Date, the Company will not be or become, an open-end investment company, unit investment trust or face-amount certificate company that is or is required to be registered under Section 8 of the Investment Company Act.

     (g) The Company will pay all expenses incidental to the performance of its obligations under this Agreement, the Indenture and the Registration Rights Agreement, including (i) the fees and expenses of the Trustee and its professional advisers; (ii) all expenses in connection with the execution, issue, authentication, packaging and initial delivery of the Offered Securities and, as applicable, the Exchange Securities (as defined in the Registration Rights Agreement), the preparation and printing of this Agreement, the Registration Rights Agreement, the Offered Securities, the Indenture, the Preliminary Offering Circular, any other documents comprising any part of the General Disclosure Package, the Final Offering Circular, all amendments and supplements thereto, each item of Supplemental Marketing Material and any other document relating to the issuance, offer, sale and delivery of the Offered Securities and as applicable, the Exchange Securities; (iii) the cost of qualifying the Offered Securities for trading in The PORTAL^SM Market (“PORTAL”) and any expenses incidental thereto; (iv) the cost of any advertising approved by the Company in connection with the issue of the Offered Securities (v) any expenses (including reasonable fees and disbursements of counsel) incurred in connection with qualification of the Offered Securities or the Exchange Securities for sale under the laws of such jurisdictions in the United States and Canada as the Purchaser designates and the printing of memoranda relating thereto (vi) for any fees charged by investment rating agencies for the rating of the Securities or the Exchange Securities, and (vii) for expenses incurred in distributing the Preliminary Offering Circular, any other documents comprising any part of the General Disclosure Package, the Final Offering Circular (including any amendments and supplements thereto) and any Supplemental Marketing Material to the Purchaser. The Company will also pay or reimburse the Purchaser (to the extent incurred by them) for all travel expenses of the Purchaser and the Company’s officers and employees and any other expenses of the Purchaser and the Company in connection with attending or hosting meetings with prospective purchasers of the Offered Securities from the Purchaser.

     (h) In connection with the offering, until the Purchaser shall have notified the Company of the completion of the resale of the Offered Securities, neither the Company nor any of its affiliates has or will, either alone or with one or more other persons, bid or purchase for any account in which it or any of its affiliates has a beneficial interest any Offered Securities or attempt to induce any person to purchase any Offered Securities; and neither it nor any of its affiliates will make bids or purchases for the purpose of creating actual, or apparent, active trading in, or of raising the price of, the Offered Securities.

     (i) For a period of 180 days after the date of the initial offering of the Offered Securities by the Purchaser, the Company will not offer, sell, contract to sell, pledge or otherwise dispose of, directly or indirectly, or file with the Commission a registration statement under the Securities Act (other than as contemplated by the Registration Rights Agreement) relating to, any United States dollar-denominated debt securities issued or guaranteed by the Company and having a maturity of more than one year from the date of issue. The Company will not at any time offer, sell, contract to sell, pledge or otherwise dispose of, directly or indirectly, any

10

securities under circumstances where such offer, sale, pledge, contract or disposition would cause the exemption afforded by Section 4(2) of the Securities Act or the safe harbor of Regulation S thereunder to cease to be applicable to the offer and sale of the Offered Securities.

     6. Free Writing Communications. (a) The Company represents and agrees that, unless it obtains the prior consent of the Purchaser, and the Purchaser represents and agrees that, unless it obtains the prior consent of the Company, it has not made and will not make any offer relating to the Offered Securities that would constitute an Issuer Free Writing Communication.

     (b) The Company consents to the use by the Purchaser of a Free Writing Communication that (i) contains only (A) information describing the preliminary terms of the Offered Securities or their offering or (B) information that describes the final terms of the Offered Securities or their offering and that is included in the Terms Communication or is included in or is subsequently included in the Final Offering Circular or (ii) does not contain any material information about the Company or its securities that was provided by or on behalf of the Company, it being understood and agreed that any such Free Writing Communication referred to in clause (i) or (ii) shall not be an Issuer Free Writing Communication for purposes of this Agreement.

     7. Conditions of the Obligation of the Purchaser. The obligation of the Purchaser to purchase and pay for the Offered Securities will be subject to the accuracy of the representations and warranties on the part of the Company and the Guarantors herein, to the accuracy of the statements of officers of the Company and the Guarantors made pursuant to the provisions hereof, to the performance by the Company and the Guarantors of their obligations hereunder and to the following additional conditions precedent:

     (a) The Purchaser shall have received letters, dated the date of this Agreement, of Deloitte & Touche LLP and KPMG LLP, in form and substance reasonably satisfactory to the Purchaser concerning the financial information with respect to the Company set forth in the General Disclosure Package and the Final Offering Circular.

     (b) Subsequent to the execution and delivery of this Agreement, there shall not have occurred (i) any change, or any development or event involving a prospective change, in the condition (financial or other), business, properties or results of operations of the Company and its subsidiaries taken as one enterprise which, in the judgment of the Purchaser, is material and adverse and makes it impractical or inadvisable to proceed with completion of the offering or the sale of and payment for the Offered Securities; (ii) any downgrading in the rating of any debt securities of the Company by any “nationally recognized statistical rating organization” (as defined for purposes of Rule 436(g) under the Securities Act), or any public announcement that any such organization has under surveillance or review its rating of any debt securities of the Company (other than an announcement with positive implications of a possible upgrading, and no implication of a possible downgrading, of such rating) or any announcement that the Company has been placed on negative outlook; (iii) any change in U.S. or international financial, political or economic conditions or currency exchange rates or exchange controls as would, in the reasonable judgment of the Purchaser, be likely to prejudice materially the success of the proposed issue, sale or distribution of the Offered Securities, whether in the primary market or in respect of dealings in the secondary market, (iv) any material suspension or material limitation of trading in securities generally on the New York Stock Exchange, or any setting of minimum prices for trading on such exchange; (v) any banking moratorium declared by U.S. Federal or New York authorities; (vi) any major disruption of settlements of securities or clearance services in the United States or (vii) any attack on, outbreak or escalation of hostilities or act of terrorism involving the United States, any declaration of war by Congress or any other national or international calamity or emergency if, in the judgment of the Purchaser, the effect of any such

11

attack, outbreak, escalation, act, declaration, calamity or emergency makes it impractical or inadvisable to proceed with completion of the offering or sale of and payment for the Offered `Securities.

     (c) The Purchaser shall have received opinions, dated the Closing Date, of Baker & McKenzie, counsel for the Company, and James Fontana, Esq., General Counsel of the Company, in each case in form and substance reasonably satisfactory to the Purchaser.

     (d) The Purchaser shall have received from Cravath, Swaine & Moore LLP, counsel for the Purchaser, such opinion or opinions, dated the Closing Date and with reference to same in the Final Offering Circular, with respect to the incorporation of the Company, the validity of the Offered Securities, the Final Offering Circular and the General Disclosure Package, the exemption from registration for the offer and sale of the Offered Securities by the Company to the Purchaser and the resales by the Purchaser as contemplated hereby and other related matters as the Purchaser may require, and the Company shall have furnished to such counsel such documents as they request for the purpose of enabling them to pass upon such matters.

     (e) The Purchaser shall have received a certificate, dated the Closing Date, of the President or any Vice President and a principal financial or accounting officer of the Company in which such officers shall state that, to the best of their knowledge after reasonable investigation, the representations and warranties of the Company and the Guarantors in this Agreement are true and correct, that the Company has complied with all agreements and satisfied all conditions on its part to be performed or satisfied hereunder at or prior to the Closing Date, and that, subsequent to the respective dates of the most recent financial statements in the General Disclosure Package, there has been no material adverse change, nor any development or event involving a prospective material adverse change, in the condition (financial or other), business, properties or results of operations of the Company and its subsidiaries taken as a whole except as set forth in the General Disclosure Package or as described in such certificate.

     (f) Each of the Company and the Guarantors shall have delivered to the Purchaser, among other documents and certificates as the Purchaser shall reasonably request, Secretary’s Certificates, dated the Closing Date, with respect to the Company and each of the Guarantors: (i) certificates of incorporation (ii) by-laws, (iii) resolutions of the Board of Directors of each entity, (iv) certificates of good standing from the jurisdiction of incorporation of each such entity and (v) certificates of good standing and/or qualifications to do business as a foreign corporation in such jurisdictions as the Purchaser shall reasonably request.

     (g) The Company and each of the Guarantors shall have executed the Registration Rights Agreement and the Indenture, and shall have provided the Purchasers with a copy of each.

     (h) The Purchaser shall have received letters, dated the Closing Date, from each of Deloitte & Touche LLP and KPMG LLP (to the extent applicable), each of which letters meets the requirements of subsection (a) of this Section, to the extent applicable, except that the specified date referred to in such subsection will be a date not more than three days prior to the Closing Date for the purposes of this subsection.

     (i) The Term B Senior Credit Facility shall have been amended to permit the issuance of $250,000,000 aggregate principal amount of the Offered Securities.

     The Company will furnish the Purchaser with such conformed copies of such opinions, certificates, letters and documents as the Purchaser reasonably requests. The Purchaser may in its sole

12

discretion waive compliance with any conditions to the obligations of the Purchaser hereunder, whether in respect of the Closing Date or otherwise.

     8. Indemnification and Contribution. (a) The Company and the Guarantors will, jointly and severally, indemnify and hold harmless the Purchaser, its officers, partners, members, directors and its affiliates and each person, if any, who controls such Purchaser within the meaning of Section 15 of the Securities Act, against any losses, claims, damages or liabilities, joint or several, to which the Purchaser may become subject, under the Securities Act or the Exchange Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon any untrue statement or alleged untrue statement of any material fact contained in the Preliminary Offering Circular or the Final Offering Circular, in each case as amended or supplemented, or any Issuer Free Writing Communication or the Exchange Act Reports, or arise out of or are based upon the omission or alleged omission to state therein a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading and will reimburse the Purchaser for any legal or other expenses reasonably incurred by the Purchaser in connection with investigating or defending any such loss, claim, damage, liability or action as such expenses are incurred; provided, however, that the Company will not be liable in any such case to the extent that any such loss, claim, damage or liability arises out of or is based upon an untrue statement or alleged untrue statement in or omission or alleged omission from any of such documents in reliance upon and in conformity with written information furnished to the Company by the Purchaser specifically for use therein, it being understood and agreed that the only such information consists of the information described as such in subsection (b) below.

     (b) The Purchaser will indemnify and hold harmless the Company and the Guarantors, their respective directors and officers and each person, if any, who controls the Company and the Guarantors within the meaning of Section 15 of the Securities Act, against any losses, claims, damages or liabilities to which the Company may become subject, under the Securities Act or the Exchange Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon any untrue statement or alleged untrue statement of any material fact contained in the Preliminary Offering Circular or the Final Offering Circular, in each case as amended or supplemented, or any Issuer Free Writing Communication or arise out of or are based upon the omission or the alleged omission to state therein a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in reliance upon and in conformity with written information furnished to the Company by the Purchaser specifically for use therein, and will reimburse any legal or other expenses reasonably incurred by the Company in connection with investigating or defending any such loss, claim, damage, liability or action as such expenses are incurred, it being understood and agreed that the only such information furnished by the Purchaser consists of the following information in the Preliminary and Final Offering Circular: under the caption “Plan of Distribution”, the first sentence of the third paragraph and the third sentence of the ninth paragraph; provided, however, that the Purchaser shall not be liable for any losses, claims, damages or liabilities arising out of or based upon the Company’s failure to perform its obligations under Section 5(a) of this Agreement.

     (c) Promptly after receipt by an indemnified party under this Section of notice of the commencement of any action, such indemnified party will, if a claim in respect thereof is to be made against the indemnifying party under subsection (a) or (b) above, notify the indemnifying party of the commencement thereof; but the failure to notify the indemnifying party shall not relieve it from any liability that it may have under subsection (a) or (b) above except to the extent that it has been materially prejudiced (through the forfeiture of substantive rights or defenses) by such failure; and provided further that the failure to notify the indemnifying party shall not relieve it from any liability that it may have to an indemnified party otherwise than under

13

subsection (a) or (b) above. In case any such action is brought against any indemnified party and it notifies the indemnifying party of the commencement thereof, the indemnifying party will be entitled to participate therein and, to the extent that it may wish, jointly with any other indemnifying party similarly notified, to assume the defense thereof, with counsel satisfactory to such indemnified party (who shall not, except with the consent of the indemnified party, be counsel to the indemnifying party), and after notice from the indemnifying party to such indemnified party of its election so to assume the defense thereof, the indemnifying party will not be liable to such indemnified party under this Section for any legal or other expenses subsequently incurred by such indemnified party in connection with the defense thereof other than reasonable costs of investigation. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement of any pending or threatened action in respect of which any indemnified party is or could have been a party and indemnity could have been sought hereunder by such indemnified party unless such settlement includes (i) an unconditional release of such indemnified party from all liability on any claims that are the subject matter of such action and (ii) does not include a statement as to or an admission of fault, culpability or failure to act by or on behalf of any indemnified party.

     (d) If the indemnification provided for in this Section is unavailable or insufficient to hold harmless an indemnified party under subsection (a) or (b) above, then each indemnifying party shall contribute to the amount paid or payable by such indemnified party as a result of the losses, claims, damages or liabilities referred to in subsection (a) or (b) above (i) in such proportion as is appropriate to reflect the relative benefits received by the Company on the one hand and the Purchaser on the other from the offering of the Offered Securities or (ii) if the allocation provided by clause (i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company on the one hand and the Purchaser on the other in connection with the statements or omissions which resulted in such losses, claims, damages or liabilities as well as any other relevant equitable considerations. The relative benefits received by the Company on the one hand and the Purchaser on the other shall be deemed to be in the same proportion as the total net proceeds from the offering (before deducting expenses) received by the Company bear to the total discounts and commissions received by the Purchaser from the Company under this Agreement. The relative fault shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company or the Purchaser and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such untrue statement or omission. The amount paid by an indemnified party as a result of the losses, claims, damages or liabilities referred to in the first sentence of this subsection (d) shall be deemed to include any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any action or claim which is the subject of this subsection (d). Notwithstanding the provisions of this subsection (d), the Purchaser shall not be required to contribute any amount in excess of the amount by which the total price at which the Offered Securities purchased by it were resold exceeds the amount of any damages which the Purchaser has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission.

     (e) The obligations of the Company and the Guarantors under this Section shall be in addition to any liability which the Company and the Guarantors may otherwise have and shall extend, upon the same terms and conditions, to each person, if any, who controls the Purchaser within the meaning of the Securities Act or the Exchange Act; and the obligations of the Purchaser under this Section shall be in addition to any liability which the Purchaser may otherwise have and shall extend, upon the same terms and conditions, to each person, if any, who controls the Company within the meaning of the Securities Act or the Exchange Act.

14

     9. Survival of Certain Representations and Obligations. The respective indemnities, agreements, representations, warranties and other statements of the Company or its officers, the Guarantors or their officers and of the Purchaser set forth in or made pursuant to this Agreement will remain in full force and effect, regardless of any investigation, or statement as to the results thereof, made by or on behalf of the Purchaser, the Company or any of their respective representatives, officers or directors or any controlling person, and will survive delivery of and payment for the Offered Securities. If for any reason the purchase of the Offered Securities by the Purchaser is not consummated, the Company and the Guarantors shall remain jointly and severally responsible for the expenses to be paid or reimbursed by it pursuant to Section 5 and the respective obligations of the Company, the Guarantors and the Purchaser pursuant to Section 8 shall remain in effect. If the purchase of the Offered Securities by the Purchaser is not consummated for any reason other than solely because of the occurrence of any event specified in clause (iii), (iv), (vi), (vii) or (viii) of Section 7(b), the Company will reimburse the Purchaser for all out-of-pocket expenses (including reasonable fees and disbursements of counsel) reasonably incurred by it in connection with the offering of the Offered Securities.

     10. Notices. All communications hereunder will be in writing and, if sent to the Purchaser will be mailed, delivered or telegraphed and confirmed to the Purchaser at Eleven Madison Avenue, New York, N.Y. 10010-3629, Attention: LCD-IBD, or, if sent to the Company or the Guarantors, will be mailed, delivered or telegraphed and confirmed to them at 1750 Tysons Boulevard, McLean, Virginia 22102, Attention: General Counsel.

     11. Successors. This Agreement will inure to the benefit of and be binding upon the parties hereto and their respective successors and the controlling persons referred to in Section 8, and no other person will have any right or obligation hereunder, except that holders of Offered Securities shall be entitled to enforce the agreements for their benefit contained in the second and third sentences of Section 5(b) hereof against the Company as if such holders were parties thereto.

     12. Counterparts. This Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original, but all such counterparts shall together constitute one and the same Agreement.

     13. Absence of Fiduciary Relationship. The Company acknowledges and agrees that:

     (a) the Purchaser has been retained solely to act as initial purchaser in connection with the initial purchase, offering and resale of the Offered Securities and that no fiduciary, advisory or agency relationship between the Company and the Purchaser has been created in respect of any of the transactions contemplated by this Agreement or the Preliminary or Final Offering Circular, irrespective of whether the Purchaser has advised or is advising the Company on other matters;

     (b) the purchase price of the Offered Securities set forth in this Agreement was established by the Company following discussions and arms-length negotiations with the Purchaser and the Company is capable of evaluating and understanding and understands and accepts the terms, risks and conditions of the transactions contemplated by this Agreement;

     (c) the Company has been advised that the Purchaser and its affiliates are engaged in a broad range of transactions which may involve interests that differ from those of the Company and that the Purchaser has no obligation to disclose such interests and transactions to Company by virtue of any fiduciary, advisory or agency relationship; and

     (d) the Company waives, to the fullest extent permitted by law, any claims it may have against the Purchaser for breach of fiduciary duty or alleged breach of fiduciary duty and agrees that the Purchaser shall have no liability (whether direct or indirect) to the Company in respect of

15

such a fiduciary duty claim or to any person asserting a fiduciary duty claim on behalf of or in right of the Company, including stockholders, employees or creditors of the Company.

     14. Applicable Law. This Agreement shall be governed by, and construed in accordance with, the laws of the State of New York without regard to principles of conflicts of laws.

     The Company and each of the Guarantors hereby submit to the non-exclusive jurisdiction of the Federal and state courts in the Borough of Manhattan in The City of New York in any suit or proceeding arising out of or relating to this Agreement or the transactions contemplated hereby.

16

     If the foregoing is in accordance with the Purchaser’s understanding of our agreement, kindly sign and return to us one of the counterparts hereof, whereupon it will become a binding agreement between the Company, the Guarantors and the Purchaser in accordance with its terms.

Very truly yours, ALION SCIENCE AND TECHNOLOGY CORPORATION
By:	/s/ John M. Hughes
	Title: Executive VP and CFO
HUMAN FACTORS APPLICATIONS, INC.,
By:	/s/ John M. Hughes
	Title: Treasurer
ALION-METI CORPORATION,
By:	/s/ John M. Hughes
	Title: Treasurer
ALION-CATI CORPORATION,
By:	/s/ John M. Hughes
	Title: Treasurer
ALION-JJMA CORPORATION,
By:	/s/ John M. Hughes
	Title: Treasurer
ALION-BMH CORPORATION,
By:	/s/ John M. Hughes
	Title: Treasurer
WASHINGTON CONSULTING, INC.,
By:	/s/ John M. Hughes
	Title: Treasurer
ALION-MA&D CORPORATION,
By:	/s/ John M. Hughes
	Title: Treasurer

The foregoing Purchase Agreement
     is hereby confirmed and accepted
     as of the date first above written.

Credit Suisse Securities (USA) LLC

By:	/s/ Malcolm Price
	Title: Managing Director

18

SCHEDULE A
General Disclosure Package

1.	The Supplement dated January 26, 2007 to the Preliminary Offering Circular.
2.	Terms Communication.

19

SCHEDULE B
Subsidiary Guarantors

Human Factors Applications, Inc.	Pennsylvania
Alion — METI Corporation	Virginia
Alion — CATI Corporation	California
Alion — JJMA Corporation	New York
Alion — BMH Corporation	Virginia
Washington Consulting, Inc.	Virginia
Alion — MA&D Corporation	Colorado

20

SCHEDULE C
ESOP Plan Documents

1. IRS Determination Letter issued by the U.S. Internal Revenue Service, dated September 11, 2003, and related correspondence

2. IRS Determination Letter issued by the U.S. Internal Revenue Service, dated August 09, 2005, and related correspondence

3. Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan, as amended and restated as of December 19, 2001

4. First Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

5. Second Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

6. Third Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

7. Fourth Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

8. Fifth Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

9. Sixth Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

10. Seventh Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

11. Eighth Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

12. Ninth Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

13. Tenth Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

14. Eleventh Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

15. Twelfth Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

16. Thirteenth Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

17. Fourteenth Amendment to the Alion Science and Technology Corporation Employee Ownership, Savings and Investment Plan

21

SCHEDULE D
Terms Communication

Issuer:	Alion Science and Technology Corporation
Security Description:	Senior Unsecured Notes
Face:	$250,000,000
Gross Proceeds:	$250,000,000
Maturity:	2/1/2015
Coupon:	10.25%
Offering Price:	$100.00
Yield to Maturity:	10.25%
Spread to Treasury:	537
Benchmark:	4.00% UST due 2/2015
Ratings:	B3 / CCC+
Interest Payment Dates:	February 1 and August 1
Commencing:	8/1/2007
Equity Clawback	Redeem until 2/1/2010 at 110.25% for up to 35.0%
Optional Redemption:	Callable, on or after the following dates, and at the following prices:

Date	Price
2/1/2011	105.125%
2/1/2012	102.563%
2/1/2013	100.000%
and thereafter

Trade Date:	1/26/2007
Settlement Date:	2/8/2007
CUSIP:	144A: 016275AE9
	RegS: U01426AA0
	ISIN: USU01426AA05
Minimum Allocations:	$2,000
Increments:	$1,000
Gross Spread:	2.50%
Book-Runner:	Credit Suisse Securities (USA) LLC

22

SCHEDULE E
Issuer Free Writing Communications

1. The Supplement dated January 26, 2007 to the Preliminary Offering Circular.

23

SCHEDULE F
Subsidiary List

	Name	Jurisdiction
1.	Human Factors Applications, Inc.	Pennsylvania
2.	Alion — METI Corporation	Virginia
3.	Alion — CATI Corporation	California
4.	Alion — JJMA Corporation	New York
5.	Alion — BMH Corporation	Virginia
6.	Washington Consulting, Inc.	Virginia
7.	Alion — MA&D Corporation	Colorado
8.	Alion Technical Services Corporation	Virginia
9.	Alion Technical Services Corporation	Delaware
10.	Alion Canada (US) Corporation	Delaware
11.	Alion — IPS Corporation	Virginia
12.	Inovative Technologies Solutions Corporation	New Mexico
13.	Alion Science and Technology (Canada) Corporation	Nova Scotia

24

EX-10.83

Exhibit 10.83

EXECUTION COPY

               AMENDMENT NO. 4 dated as of February 6, 2007 (this “Amendment”), to the CREDIT AGREEMENT dated as of August 2, 2004, as amended pursuant to that certain Incremental Term Loan Assumption Agreement and Amendment No. 1 dated as of April 1, 2005, that certain Incremental Term Loan Assumption Agreement and Amendment No. 2 dated as of March 24, 2006, as amended as of April 21, 2006, and that certain Incremental Term Loan Assumption Agreement and Amendment No. 3 dated as of June 30, 2006 (as so amended, the “Credit Agreement”), among ALION SCIENCE AND TECHNOLOGY CORPORATION (the “Borrower”), the Subsidiary Guarantors listed on the signature pages hereto (solely with respect to Sections 4, 6, 7, 9, 10 and 11 hereof), the lenders from time to time party to the Credit Agreement (the “Lenders”) and CREDIT SUISSE (formerly known as Credit Suisse First Boston), as administrative agent (in such capacity, the “Administrative Agent”) and as collateral agent for the Lenders.

     A. Pursuant to the Credit Agreement, the Lenders have extended, and have agreed to extend, credit to the Borrower.

     B. The Borrower has requested certain amendments to the Credit Agreement as set forth herein, and the Lenders have agreed to such request on and subject to the terms and conditions of this Amendment.

     Accordingly, in consideration of the mutual agreements herein contained and other good and valuable consideration, the sufficiency and receipt of which are hereby acknowledged, the parties hereto agree as follows:

     SECTION 1. Defined Terms; Interpretation; Etc. Capitalized terms used and not defined herein shall have the meanings assigned to such terms in the Credit Agreement. The rules of construction set forth in Section 1.02 of the Credit Agreement shall apply equally to this Amendment. This Amendment shall be a “Loan Document” for all purposes of the Credit Agreement and the other Loan Documents.

     SECTION 2. Amendments to Credit Agreement. Effective as of the Amendment No. 4 Effective Date (as defined below):

          (a) The definition of the term “Applicable Percentage” set forth in Section 1.01 of the Credit Agreement is hereby amended as follows (such amendment, the “Term Loan Repricing”):

(i)	by deleting “2.75%” at the end of clause (a) therein and substituting therefor “2.50%”; and
(ii)	by deleting “1.75%” at the end of clause (b) therein and substituting therefor “1.50%”.

          (b) The definition of the term “Available Restricted Payment Amount” set forth in Section 1.01 of the Credit Agreement is hereby amended by deleting the reference to “Section 6.06(iv)(E)” set forth therein and substituting therefor a reference to “Section 6.06(iv)(G)”.

2

          (c) The definition of the term “Revolving Credit Maturity Date” set forth in Section 1.01 of the Credit Agreement is hereby amended and restated in its entirety to read as follows:

               “Revolving Credit Maturity Date” shall mean August 2, 2009, or such later date as may be agreed to in writing by the Borrower and all the Revolving Credit Lenders.

          (d) The definition of the term “Term Loan Maturity Date” set forth in Section 1.01 of the Credit Agreement is hereby amended by deleting the words “August 2, 2009” set forth therein and substituting therefor the words “February 6, 2013” (such amendment, the “Term Loan Maturity Date Extension”).

          (e) Section 2.11(a) of the Credit Agreement is hereby amended and restated in its entirety to read as follows (such amendment, the “Amortization Amendment”):

“(a) The Borrower shall pay to the Administrative Agent, for the accounts of the Term Lenders, on the dates set forth below, or if any such date is not a Business Day, on the immediately preceding Business Day (each such date being called a “Repayment Date”), a principal amount of the Term Loans (as adjusted from time to time pursuant to Sections 2.12, 2.13(f) and 2.24(d)) equal to the amount set forth below for such date, together in each case with accrued and unpaid interest on the principal amount to be paid to but excluding the date of such payment:

Repayment Date	Amount
March 31, 2007	$	683,400
June 30, 2007	$	683,400
September 30, 2007	$	683,400
December 31, 2007	$	683,400
March 31, 2008	$	683,400
June 30, 2008	$	683,400
September 30, 2008	$	683,400
December 31, 2008	$	683,400
March 31, 2009	$	683,400
June 30, 2009	$	683,400
September 30, 2009	$	683,400
December 31, 2009	$	683,400
March 31, 2010	$	683,400
June 30, 2010	$	683,400
September 30, 2010	$	683,400
December 31, 2010	$	683,400
March 31, 2011	$	683,400

3

Repayment Date	Amount
June 30, 2011	$	683,400
September 30, 2011	$	683,400
December 31, 2011	$	683,400
March 31, 2012	$	683,400
June 30, 2012	$	683,400
September 30, 2012	$	683,400
December 31, 2012	$	683,400
Term Loan Maturity Date	$	256,958,400

     (f) Section 6.01(j) (Subordinated Indebtedness) of the Credit Agreement is hereby amended by inserting immediately after the words “the proceeds of which are used” set forth therein the words “to prepay, redeem, retire or otherwise acquire the Seller Subordinated Notes and/or the Warrants, in whole or in part, or”.

     (g) Section 6.01(r) (Bridge Loan Refinancing Indebtedness) of the Credit Agreement is hereby amended by deleting the amount “$200,000,000” set forth therein and substituting therefor the amount “$250,000,000”.

     (h) Section 6.01 (Indebtedness) of the Credit Agreement is hereby further amended by adding the following at the end thereof:

“Notwithstanding the foregoing, neither the Borrower nor any of the Subsidiaries shall incur, create, assume or permit to exist any Indebtedness otherwise permitted by the foregoing provisions of this Section 6.01 (other than Revolving Loans, Swingline Loans and Indebtedness in respect of Letters of Credit) at any time during any period set forth below if, at the time thereof and after giving effect thereto, the Leverage Ratio at such time would exceed the ratio set forth below for such period:

Period	Ratio
February 6, 2007 through September 30, 2007	6.75 to 1.00
October 1, 2007 through September 30, 2008	6.50 to 1.00
October 1, 2008 through September 30, 2009	6.25 to 1.00
October 1, 2009 through September 30, 2010	6.00 to 1.00
Thereafter	5.75 to 1.00

     (i) Section 6.06(a) (Restricted Payments) of the Credit Agreement is hereby amended and restated in its entirety to read as follows:

4

“(a) Declare or make, or agree to declare or make, directly or indirectly, any Restricted Payment (including pursuant to any Synthetic Purchase Agreement), or incur any obligation (contingent or otherwise) to do so; provided, however, that (i) any Subsidiary may declare and pay dividends or make other distributions ratably to its equity holders, (ii) the Borrower may pay, satisfy and discharge the Mezzanine Warrant Put Right if, when and to the extent exercised, (iii) so long as no Default or Event of Default shall have occurred and be continuing or would result therefrom, the Borrower may repurchase its Equity Interests owned by directors, officers and employees of the Borrower or the Subsidiaries or make payments to directors, officers and employees of the Borrower or the Subsidiaries in connection with Warrants, stock options, stock appreciation rights, “phantom” stock plans or similar equity incentives or equity based incentives pursuant to management or other incentive plans or in connection with the death or disability of such directors, officers and employees in an aggregate amount not to exceed $20,000,000 and (iv) so long as no Default or Event of Default shall have occurred and be continuing or would result therefrom (except with respect to subclauses (A), (B), (D) and (F) below), Restricted Payments may be made (A) in connection with the redemption or repurchase for value of any Equity Interests of the Borrower as a result of distributions by the ESOT of such Equity Interests to participants in the ESOP pursuant to the ESOP Plan Documents subsequent to their termination of employment with the Borrower or any Controlled Group member, (B) as required by Section 401(a)(28) of the Code or any substantially similar requirement of law, (C) in the form of administrative fees or expenses of the ESOP or the ESOT, including the fees of the ESOT Trustee, (D) as contributions to the ESOT as required under the ESOP Plan Documents, (E) to redeem or otherwise acquire for value the Warrants issued in connection with the Seller Subordinated Notes so long as, after giving effect thereto, the Borrower would be in pro forma compliance with Sections 6.12 and 6.13 and there would be at least $10,000,000 of unused and available Revolving Credit Commitments, (F) in connection with the redemption or repurchase of any Equity Interests of the Borrower resulting from non-statutory diversification elections under the ESOP Plan Documents or (G) so long as, after giving effect thereto, the Senior Secured Leverage Ratio would be less than 2.50 to 1.00 and there would be at least $10,000,000 of unused and available Revolving Credit Commitments, in an amount not to exceed the Available Restricted Payment Amount.”

     (j) Section 6.07 (Transactions with Affiliates) of the Credit Agreement is hereby amended by inserting after the words “Restricted Payments may be made to the extent provided in Section 6.06” in clause (b) thereof the words “and Seller Subordinated Notes may be prepaid, redeemed, retired or otherwise acquired for consideration to the extent provided in Section 6.09(c)”.

     (k) The last sentence of Section 6.09(c) (Prepayments of Seller Subordinated Notes) of the Credit Agreement is hereby amended by deleting the words “Senior Secured

5

Leverage Ratio would be less than 2.50 to 1.00” and substituting therefor the words “Borrower would be in pro forma compliance with Sections 6.12 and 6.13”.

     (l) Section 6.12 (Interest Coverage Ratio) of the Credit Agreement is hereby amended and restated in its entirety to read as follows:

     SECTION 6.12 Interest Coverage Ratio. Permit the Interest Coverage Ratio for any period of four consecutive quarters, in each case taken as one accounting period, to be less than 1.35 to 1.00.

     (m) Section 6.13 (Leverage Ratio) of the Credit Agreement is hereby amended and restated in its entirety to read as follows:

     SECTION 6.13 Maximum Senior Secured Leverage Ratio. Permit the Senior Secured Leverage Ratio at the end of any fiscal quarter during a period set forth below to be greater than the ratio set forth opposite such period below:

Period	Ratio
February 6, 2007 through September 30, 2007	4.00 to 1.00
October 1, 2007 through September 30, 2008	3.75 to 1.00
October 1, 2008 through September 30, 2009	3.25 to 1.00
Thereafter	3.00 to 1.00

     SECTION 3. Representations and Warranties. To induce the other parties hereto to enter into this Amendment, the Borrower represents and warrants to the Administrative Agent and each of the Lenders that, as of the Amendment No. 4 Effective Date:

          (a) This Amendment has been duly authorized, executed and delivered by each Loan Party party hereto, and constitutes a legal, valid and binding obligation of such Loan Party in accordance with its terms. The Credit Agreement (as amended hereby) constitutes a legal, valid and binding obligation of the Borrower in accordance with its terms.

          (b) The representations and warranties set forth in Article III of the Credit Agreement are true and correct in all material respects on and as of the Amendment No. 4 Effective Date with the same effect as though made on and as of the Amendment No. 4 Effective Date, except to the extent such representations and warranties expressly relate to an earlier date (in which case such representations and warranties were true and correct in all material respects as of such earlier date).

          (c) No Default or Event of Default has occurred and is continuing.

     SECTION 4. Effectiveness. This Amendment shall become effective as of the date (the “Amendment No. 4 Effective Date”) that (a) the Administrative Agent shall have received counterparts of this Amendment that, when taken together, bear the signatures of (i) the Borrower, (ii) each Subsidiary Guarantor, (iii) the Administrative Agent and (iv) the Required Lenders and (b) each of the conditions precedent set forth in Section 5 hereof shall have been

6

satisfied (or waived in writing by the Required Lenders); provided, however, that none of the Term Loan Repricing, the Term Loan Maturity Date Extension or the Amortization Amendment shall become effective unless this Amendment also shall have been executed by each of the Term Lenders (after giving effect to all prior or concurrent assignments by Term Lenders, whether pursuant to Section 2.21 or otherwise).

     SECTION 5. Additional Conditions Precedent to Effectiveness. On the Amendment No. 4 Effective Date:

          (a) Each of the conditions set forth in paragraphs (b) and (c) of Section 3 hereof shall be satisfied and the Administrative Agent shall have received a certificate to that effect dated as of the Amendment No. 4 Effective Date and executed by a Financial Officer of the Borrower.

          (b) The Administrative Agent shall have received such legal opinions, board resolutions and other closing certificates and documentation as it shall reasonably require, in each case consistent with those delivered on the Closing Date under clauses (a), (c) and (d) of Section 4.02 of the Credit Agreement.

          (c) The Administrative Agent shall have received all fees and other amounts due and payable on or prior to the Amendment No. 4 Effective Date, including, to the extent invoiced, reimbursement or payment of all out-of-pocket expenses required to be reimbursed or paid by the Borrower hereunder or under any other Loan Document.

     SECTION 6. Effect of Amendment. Except as expressly set forth herein, this Amendment shall not by implication or otherwise limit, impair, constitute a waiver of, or otherwise affect the rights and remedies of the Lenders, the Administrative Agent, the Collateral Agent or the Borrower under the Credit Agreement or any other Loan Document, and shall not alter, modify, amend or in any way affect any of the terms, conditions, obligations, covenants or agreements contained in the Credit Agreement or any other Loan Document, all of which are ratified and affirmed in all respects and shall continue in full force and effect. Nothing herein shall be deemed to entitle any Loan Party to a consent to, or a waiver, amendment, modification or other change of, any of the terms, conditions, obligations, covenants or agreements contained in the Credit Agreement or any other Loan Document in similar or different circumstances. This Amendment shall apply and be effective only with respect to the provisions of the Credit Agreement specifically referred to herein. After the date hereof, any reference to the Credit Agreement shall mean the Credit Agreement, as modified hereby.

     SECTION 7. Consent and Reaffirmation. Each Subsidiary Guarantor hereby consents to this Amendment and the transactions contemplated hereby, and each Loan Party hereby (a) agrees that, notwithstanding the effectiveness of this Amendment, the Guarantee and Collateral Agreement and each of the other Security Documents continue to be in full force and effect, (b) confirms its guarantee of the Obligations (with respect to each Subsidiary Guarantor) and its grant of a security interest in its assets as Collateral therefor, all as provided in the Loan Documents as originally executed and (c) acknowledges that such guarantee and/or grant continue in full force and effect in respect of, and to secure, the Obligations under the Credit Agreement (as amended hereby) and the other Loan Documents.

     SECTION 8. Expenses. The Borrower agrees to reimburse the Administrative Agent for all reasonable out-of-pocket expenses incurred in connection with this Amendment in

7

accordance with the Credit Agreement, including the reasonable fees, charges and disbursements of counsel for the Administrative Agent.

     SECTION 9. Counterparts. This Amendment may be executed in any number of counterparts and by different parties hereto in separate counterparts, each of which when so executed and delivered shall be deemed an original, but all such counterparts together shall constitute but one and the same contract. Delivery of an executed counterpart of a signature page of this Amendment by facsimile or electronic transmission shall be as effective as delivery of a manually executed counterpart hereof.

     SECTION 10. Applicable Law. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

     SECTION 11. Headings. The headings of this Amendment are for purposes of reference only and shall not limit or otherwise affect the meaning hereof.

[Remainder of this page intentionally left blank]

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their respective authorized officers as of the day and year first above written.

ALION SCIENCE AND TECHNOLOGY CORPORATION,
By	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Executive VP and CFO
HUMAN FACTORS APPLICATIONS, INC.,
By	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer
ALION-METI CORPORATION
By	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer
ALION-CATI CORPORATION
By	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer
ALION-JJMA CORPORATION
By	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer
ALION-BMH CORPORATION
By	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer

[Alion Amendment]

WASHINGTON CONSULTING, INC.
By	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer
ALION-MA&D CORPORATION
By	/s/ John M. Hughes
	Name:  John M. Hughes
	Title:  Treasurer

[Alion Amendment]

CREDIT SUISSE, CAYMAN ISLANDS BRANCH, individually as a Lender and as Administrative Agent,
By	/s/ Robert Hetu
	Name:  Robert Hetu
	Title:  Managing Director
By	/s/ Cassandra Droogan
	Name:  Cassandra Droogan
	Title:  Vice President

[Alion Amendment]

SIGNATURE PAGE TO AMENDMENT NO. 4
DATED AS OF FEBRUARY 6, 2007,
TO THE ALION SCIENCE AND
TECHNOLOGY CORPORATION
CREDIT AGREEMENT DATED AS OF
AUGUST 2, 2004, AS AMENDED

Name of Lender:
By
	Name:
	Title:

[Alion Amendment]

EX-10.84

Exhibit 10.84

EXECUTION COPY

$250,000,000

ALION SCIENCE AND TECHNOLOGY CORPORATION

10¹/4% Senior Notes due 2015

REGISTRATION RIGHTS AGREEMENT

February 8, 2007

Credit Suisse Securities (USA) LLC

   Eleven Madison Avenue

      New York, New York 10010-3629

Dear Sirs:

     Alion Science and Technology Corporation, a Delaware corporation (the “Issuer”), proposes to issue and sell to Credit Suisse Securities (USA) LLC (the “Purchaser”), upon the terms set forth in a purchase agreement of even date herewith (the “Purchase Agreement”), $250,000,000 aggregate principal amount of its 10¹/4% Senior Notes due 2015 (the “Initial Securities”), to be unconditionally guaranteed by the Guarantors (as such term is defined in the Purchase Agreement and, together with the Issuer, the “Company”). The Initial Securities will be issued pursuant to an Indenture, dated February 8, 2007 (the “Indenture”), among the Issuer, the Guarantors and Wilmington Trust Company (the “Trustee”). As an inducement to the Purchaser, the Company agrees with the Purchaser, for the benefit of the holders of the Initial Securities (including, without limitation, the Purchaser), the Exchange Securities (as defined below) and the Private Exchange Securities (as defined below) (collectively the “Holders”), as follows:

     1. Registered Exchange Offer. The Company shall, at its own cost, prepare and, not later than 90 days after (or if the 90th day is not a business day, the first business day thereafter) the date of original issue of the Initial Securities (the “Issue Date”), file with the Securities and Exchange Commission (the “Commission”) a registration statement (the “Exchange Offer Registration Statement”) on an appropriate form under the Securities Act of 1933, as amended (the “Securities Act”), with respect to a proposed offer (the “Registered Exchange Offer”) to the Holders of Transfer Restricted Securities (as defined in Section 6 hereof), who are not prohibited by any U.S. federal law or policy of the Commission from participating in the Registered Exchange Offer, to issue and deliver to such Holders, in exchange for the Initial Securities, a like aggregate principal amount of debt securities (the “Exchange Securities”) of the Company issued under the Indenture and identical in all material respects to the Initial Securities (except for the transfer restrictions relating to the Initial Securities and the provisions relating to the matters described in Section 6 hereof) that would be registered under the Securities Act. The Company shall use its reasonable best efforts to cause such Exchange Offer Registration Statement to become effective under the Securities Act within 240 days (or if the 240th day is not a business day, the first business day thereafter) after the Issue Date of the Initial Securities and shall keep the Exchange Offer Registration Statement effective for not less than 30 days (or longer, if required by applicable law) after the date notice of the Registered Exchange Offer is mailed to the Holders (such period being called the “Exchange Offer Registration Period”).

     If the Company effects the Registered Exchange Offer, the Company will be entitled to close the Registered Exchange Offer 30 days after the commencement thereof provided that the Company has accepted all the Initial Securities theretofore validly tendered in accordance with the terms of the Registered Exchange Offer.

     Following the declaration of the effectiveness of the Exchange Offer Registration Statement, the Company shall promptly commence the Registered Exchange Offer, it being the objective of such Registered Exchange Offer to enable each Holder of Transfer Restricted Securities (as defined in Section 6 hereof) electing to exchange the Initial Securities for Exchange Securities (assuming that such Holder is not an affiliate of the Company within the meaning of the Securities Act, acquires the Exchange Securities in the ordinary course of such Holder’s business and has no arrangements with any person to participate in the distribution of the Exchange Securities and is not prohibited by any U.S. federal law or policy of the Commission from participating in the Registered Exchange Offer) to trade such Exchange Securities from and after their receipt without any limitations or restrictions under the Securities Act and without material restrictions under the securities laws of the several states of the United States.

     The Company acknowledges that, pursuant to current interpretations by the Commission’s staff of Section 5 of the Securities Act, in the absence of an applicable exemption therefrom, (i) each Holder which is a broker-dealer electing to exchange Securities, acquired for its own account as a result of market making activities or other trading activities, for Exchange Securities (an “Exchanging Dealer”), is required to deliver a prospectus containing the information set forth in (a) Annex A hereto on the cover, (b) Annex B hereto in the “Exchange Offer Procedures” section and the “Purpose of the Exchange Offer” section, and (c) Annex C hereto in the “Plan of Distribution” section of such prospectus in connection with a sale of any such Exchange Securities received by such Exchanging Dealer pursuant to the Registered Exchange Offer and (ii) the Purchaser, should it elect to sell Exchange Securities acquired in exchange for Securities constituting any portion of an unsold allotment, will be required to deliver a prospectus containing the information required by Items 507 or 508 of Regulation S-K under the Securities Act, as applicable, in connection with such sale.

     The Company shall use its reasonable best efforts to keep the Exchange Offer Registration Statement effective and to amend and supplement the prospectus contained therein, in order to permit such prospectus to be lawfully delivered by all persons subject to the prospectus delivery requirements of the Securities Act for such period of time as such persons must comply with such requirements in order to resell the Exchange Securities; provided, however, that (i) in the case where such prospectus and any amendment or supplement thereto must be delivered by an Exchanging Dealer or the Purchaser, such period shall be the lesser of 180 days and the date on which the Purchaser and all Exchanging Dealers have sold all Exchange Securities held by them (unless such period is extended pursuant to Section 3(j) below) and (ii) the Company shall make such prospectus and any amendment or supplement thereto, available to any broker-dealer for use in connection with any resale of any Exchange Securities for a period of not less than 90 days after the consummation of the Registered Exchange Offer.

     If, upon consummation of the Registered Exchange Offer, the Purchaser holds Initial Securities acquired by it as part of its initial distribution, the Company, simultaneously with the delivery of the Exchange Securities pursuant to the Registered Exchange Offer, shall issue and deliver to the Purchaser upon its written request, in exchange (the “Private Exchange”) for the Initial Securities held by the Purchaser, a like principal amount of debt securities of the Company issued under the Indenture and identical in all material respects (including the existence of restrictions on transfer under the Securities Act and the securities laws of the several states of the United States, but excluding provisions relating to the matters described in Section 6 hereof) to the Initial Securities (the “Private Exchange Securities”). The Initial Securities, the Exchange Securities and the Private Exchange Securities are herein collectively called the “Securities”.

     In connection with the Registered Exchange Offer, the Company shall:

     (a) mail to each Holder a copy of the prospectus forming part of the Exchange Offer Registration Statement, together with an appropriate letter of transmittal and related documents;

     (b) keep the Registered Exchange Offer open for not less than 30 days (or longer, if required by applicable law) after the date notice thereof is mailed to the Holders;

2

     (c) utilize the services of a depositary for the Registered Exchange Offer with an address in the Borough of Manhattan, The City of New York, which may be the Trustee or an affiliate of the Trustee;

     (d) permit Holders to withdraw tendered Securities at any time prior to the close of business, New York time, on the last business day on which the Registered Exchange Offer shall remain open; and

     (e) otherwise comply with all applicable laws.

     As soon as practicable after the close of the Registered Exchange Offer or the Private Exchange, as the case may be, the Company shall:

     (x) accept for exchange all the Securities validly tendered and not withdrawn pursuant to the Registered Exchange Offer and the Private Exchange;

     (y) deliver to the Trustee for cancellation all the Initial Securities so accepted for exchange; and

     (z) cause the Trustee to authenticate and deliver promptly to each Holder of the Initial Securities, Exchange Securities or Private Exchange Securities, as the case may be, equal in principal amount to the Initial Securities of such Holder so accepted for exchange.

     The Indenture will provide that the Exchange Securities will not be subject to the transfer restrictions set forth in the Indenture and that all the Securities will vote and consent together on all matters as one class and that none of the Securities will have the right to vote or consent as a class separate from one another on any matter.

     Interest on each Exchange Security and Private Exchange Security issued pursuant to the Registered Exchange Offer and in the Private Exchange will accrue from the last interest payment date on which interest was paid on the Initial Securities surrendered in exchange therefor or, if no interest has been paid on the Initial Securities, from the date of original issue of the Initial Securities.

     Each Holder participating in the Registered Exchange Offer shall be required to represent to the Company that at the time of the consummation of the Registered Exchange Offer (i) any Exchange Securities received by such Holder will be acquired in the ordinary course of business, (ii) such Holder will have no arrangements or understanding with any person to participate in the distribution of the Securities or the Exchange Securities within the meaning of the Securities Act, (iii) such Holder is not an “affiliate,” as defined in Rule 405 of the Securities Act, of the Company or if it is an affiliate, such Holder will comply with the registration and prospectus delivery requirements of the Securities Act to the extent applicable, (iv) if such Holder is not a broker-dealer, that it is not engaged in, and does not intend to engage in, the distribution of the Exchange Securities and (v) if such Holder is a broker-dealer, that it will receive Exchange Securities for its own account in exchange for Initial Securities that were acquired as a result of market-making activities or other trading activities and that it will be required to acknowledge that it will deliver a prospectus in connection with any resale of such Exchange Securities.

     Notwithstanding any other provisions hereof, the Company will ensure that (i) any Exchange Offer Registration Statement and any amendment thereto and any prospectus forming part thereof and any supplement thereto complies in all material respects with the Securities Act and the rules and regulations thereunder, (ii) any Exchange Offer Registration Statement and any amendment thereto does not, when it becomes effective, contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading and (iii) any prospectus forming part of any Exchange Offer Registration Statement, and any supplement to such prospectus, does

3

not include an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

     2. Shelf Registration. If, (i) because of any change in law or in applicable interpretations thereof by the staff of the Commission, the Company is not permitted to effect a Registered Exchange Offer, as contemplated by Section 1 hereof, (ii) the Registered Exchange Offer is not consummated within 240 days of the Issue Date, (iii) the Purchaser promptly notifies the Company after becoming aware following consummation of the Registered Exchange Offer that the Initial Securities (or the Private Exchange Securities) held by it are not eligible to be exchanged for Exchange Securities in the Registered Exchange Offer; or (iv) any Holder (other than an Exchanging Dealer) promptly notifies the Company after becoming aware that they are prohibited by law or SEC policy from participating in the Registered Exchange Offer or, in the case of any Holder (other than an Exchanging Dealer) that participates in the Registered Exchange Offer, such Holder does not receive freely tradeable Exchange Securities on the date of the exchange, the Company shall take the following actions:

     (a) The Company shall, at its cost, as promptly as practicable (but in no event more than 60 days (or 300 days in the case of the event described in the immediately preceding clause (i)) after so required or requested pursuant to this Section 2) file with the Commission and thereafter shall use its reasonable best efforts to cause to be declared effective (unless it becomes effective automatically upon filing) a registration statement (the “Shelf Registration Statement” and, together with the Exchange Offer Registration Statement, a “Registration Statement”) on an appropriate form under the Securities Act relating to the offer and sale of the Transfer Restricted Securities (as defined in Section 6 hereof) by the Holders thereof from time to time in accordance with the methods of distribution set forth in the Shelf Registration Statement and Rule 415 under the Securities Act (hereinafter, the “Shelf Registration”); provided, however, that no Holder (other than the Purchaser) shall be entitled to have the Securities held by it covered by such Shelf Registration Statement unless such Holder agrees in writing to be bound by all the provisions of this Agreement applicable to such Holder.

     (b) The Company shall use its reasonable best efforts to keep the Shelf Registration Statement continuously effective in order to permit the prospectus included therein to be lawfully delivered by the Holders of the relevant Securities, for a period of two years (or for such longer period if extended pursuant to Section 3(j) below, but, if the triggering event for an extension arises under Section 3(b)(iv), then such period shall be extended only for such Holders as are subject to the jurisdiction issuing the notice described in Section 3(b)(iv)) from the Issue Date or such shorter period that will terminate when all the Securities covered by the Shelf Registration Statement (i) have been sold pursuant thereto or (ii) are no longer restricted securities (as defined in Rule 144 under the Securities Act, or any successor rule thereof). The Company shall be deemed not to have used its reasonable best efforts to keep the Shelf Registration Statement effective during the requisite period if it voluntarily takes any action that would result in Holders of Securities covered thereby not being able to offer and sell such Securities during that period, unless such action is required by applicable law.

     (c) Notwithstanding any other provisions of this Agreement to the contrary, the Company shall cause the Shelf Registration Statement and the related prospectus and any amendment or supplement thereto, as of the effective date of the Shelf Registration Statement, amendment or supplement, (i) to comply in all material respects with the applicable requirements of the Securities Act and the rules and regulations of the Commission and (ii) not to contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading.

4

     3. Registration Procedures. In connection with any Shelf Registration contemplated by Section 2 hereof and, to the extent applicable, any Registered Exchange Offer contemplated by Section 1 hereof, the following provisions shall apply:

     (a) The Company shall (i) furnish to the Purchaser, prior to the filing thereof with the Commission, a copy of the Registration Statement and each amendment thereof and each supplement, if any, to the prospectus included therein and, in the event that the Purchaser (with respect to any portion of an unsold allotment from the original offering) is participating in the Registered Exchange Offer or the Shelf Registration Statement, the Company shall use its reasonable best efforts to reflect in each such document, when so filed with the Commission, such comments as the Purchaser reasonably may propose; (ii) include the information set forth in Annex A hereto on the cover, in Annex B hereto in the “Exchange Offer Procedures” section and the “Purpose of the Exchange Offer” section and in Annex C hereto in the “Plan of Distribution” section of the prospectus forming a part of the Exchange Offer Registration Statement and include the information set forth in Annex D hereto in the Letter of Transmittal delivered pursuant to the Registered Exchange Offer; (iii) if requested by the Purchaser, include the information required by Items 507 or 508 of Regulation S-K under the Securities Act, as applicable, in the prospectus forming a part of the Exchange Offer Registration Statement; (iv) include within the prospectus contained in the Exchange Offer Registration Statement a section entitled “Plan of Distribution,” reasonably acceptable to the Purchaser, which shall contain a summary statement of the positions taken or policies made by the staff of the Commission with respect to the potential “underwriter” status of any broker-dealer that is the beneficial owner (as defined in Rule 13d-3 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) of Exchange Securities received by such broker-dealer in the Registered Exchange Offer (a “Participating Broker-Dealer”), whether such positions or policies have been publicly disseminated by the staff of the Commission or such positions or policies, in the reasonable judgment of the Purchaser based upon advice of counsel (which may be in-house counsel), represent the prevailing views of the staff of the Commission; and (v) in the case of a Shelf Registration Statement, include in the prospectus included in the Shelf Registration Statement (or, if permitted by Commission Rule 430B(b), in a prospectus supplement that becomes a part thereof pursuant to Commission Rule 430B(f)) that is delivered to any Holder pursuant to Section 3(d) and (f), the names of the Holders, who propose to sell Securities pursuant to the Shelf Registration Statement, as selling securityholders.

     (b) The Company shall give written notice to the Purchaser, the Holders of the Securities and any Participating Broker-Dealer from whom the Company has received prior written notice that it will be a Participating Broker-Dealer in the Registered Exchange Offer (which notice pursuant to clauses (ii)-(v) hereof shall be accompanied by an instruction to suspend the use of the prospectus until the requisite changes have been made):

     (i) when the Registration Statement or any amendment thereto has been filed with the Commission and when the Registration Statement or any post-effective amendment thereto has become effective;

     (ii) of any request by the Commission for amendments or supplements to the Registration Statement or the prospectus included therein or for additional information;

     (iii) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or the initiation of any proceedings for that purpose, of the issuance by the Commission of a notification of objection to the use of the form on which the Registration Statement has been filed, and of the happening of any event that causes the Company to become an “ineligible issuer,” as defined in Commission Rule 405.

5

     (iv) of the receipt by the Company or its legal counsel of any notification with respect to the suspension of the qualification of the Securities for sale in any jurisdiction or the initiation or threatening of any proceeding for such purpose; and

     (v) of the happening of any event that requires the Company to make changes in the Registration Statement or the prospectus in order that the Registration Statement or the prospectus do not contain an untrue statement of a material fact nor omit to state a material fact required to be stated therein or necessary to make the statements therein (in the case of the prospectus, in light of the circumstances under which they were made) not misleading.

     (c) The Company shall make every reasonable effort to obtain the withdrawal at the earliest possible time, of any order suspending the effectiveness of the Registration Statement.

     (d) The Company shall furnish to each Holder of Securities included within the coverage of the Shelf Registration, without charge, at least one copy of the Shelf Registration Statement and any post-effective amendment or supplement thereto, including financial statements and schedules, and, if the Holder so requests in writing, all exhibits thereto (including those, if any, incorporated by reference). The Company shall not, without the prior consent of the Purchaser, make any offer relating to the Securities that would constitute a “free writing prospectus,” as defined in Commission Rule 405.

     (e) The Company shall deliver to the Purchaser, each Exchanging Dealer and to any other Holder who so requests, without charge, at least one copy of the Exchange Offer Registration Statement and any post-effective amendment thereto, including financial statements and schedules, and, if the Purchaser or any such Holder requests, all exhibits thereto (including those incorporated by reference).

     (f) The Company shall, during the Shelf Registration Period, deliver to each Holder of Securities included within the coverage of the Shelf Registration, without charge, as many copies of the prospectus (including each preliminary prospectus) included in the Shelf Registration Statement and any amendment or supplement thereto as such person may reasonably request. The Company consents, subject to the provisions of this Agreement, to the use of the prospectus or any amendment or supplement thereto by each of the selling Holders of the Securities in connection with the offering and sale of the Securities covered by the prospectus, or any amendment or supplement thereto, included in the Shelf Registration Statement.

     (g) The Company shall deliver to the Purchaser, any Exchanging Dealer, any Participating Broker-Dealer and such other persons required to deliver a prospectus following the Registered Exchange Offer, without charge, as many copies of the final prospectus included in the Exchange Offer Registration Statement and any amendment or supplement thereto as such persons may reasonably request. The Company consents, subject to the provisions of this Agreement, to the use of the prospectus or any amendment or supplement thereto by the Purchaser, if necessary, any Participating Broker-Dealer and such other persons required to deliver a prospectus following the Registered Exchange Offer in connection with the offering and sale of the Exchange Securities covered by the prospectus, or any amendment or supplement thereto, included in such Exchange Offer Registration Statement.

     (h) Prior to any public offering of the Securities, pursuant to any Registration Statement, the Company shall register or qualify or cooperate with the Holders of the Securities included therein and their respective counsel in connection with the registration or qualification of the Securities for offer and sale under the securities or “blue sky” laws of such states of the United States as any Holder of the Securities reasonably requests in writing and do any and all other acts or things necessary or advisable to enable the offer and sale in such jurisdictions of the Securities

6

covered by such Registration Statement; provided, however, that the Company shall not be required to (i) qualify generally to do business in any jurisdiction where it is not then so qualified or (ii) take any action which would subject it to general service of process or to taxation in any jurisdiction where it is not then so subject.

     (i) The Company shall cooperate with the Holders of the Securities to facilitate the timely preparation and delivery of certificates representing the Securities to be sold pursuant to any Registration Statement free of any restrictive legends and in such denominations and registered in such names as the Holders may request a reasonable period of time prior to sales of the Securities pursuant to such Registration Statement.

     (j) Upon the occurrence of any event contemplated by paragraphs (ii) through (v) of Section 3(b) above during the period for which the Company is required to maintain an effective Registration Statement, the Company shall promptly prepare and file a post-effective amendment to the Registration Statement or a supplement to the related prospectus and any other required document so that, as thereafter delivered to Holders of the Securities or purchasers of Securities, the prospectus will not contain an untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein, in light of the circumstances under which they were made, not misleading. If the Company notifies the Purchaser, the Holders of the Securities and any known Participating Broker-Dealer in accordance with paragraphs (ii) through (v) of Section 3(b) above to suspend the use of the prospectus until the requisite changes to the prospectus have been made, then the Purchaser, the Holders of the Securities and any such Participating Broker-Dealers shall suspend use of such prospectus, and the period of effectiveness of the Shelf Registration Statement provided for in Section 2(b) above and the Exchange Offer Registration Statement provided for in Section 1 above shall each be extended by the number of days from and including the date of the giving of such notice to and including the date when the Purchaser, the Holders of the Securities and any known Participating Broker-Dealer shall have received such amended or supplemented prospectus pursuant to this Section 3(j). During the period during which the Company is required to maintain an effective Shelf Registration Statement pursuant to this Agreement, the Company will prior to the two-year expiration of that Shelf Registration Statement file, and use its reasonable best efforts to cause to be declared effective (unless it becomes effective automatically upon filing) within a period that avoids any interruption in the ability of Holders of Securities covered by the expiring Shelf Registration Statement to make registered dispositions, a new registration statement relating to the Securities, which shall be deemed the “Shelf Registration Statement” for purposes of this Agreement.

     (k) Not later than the effective date of the applicable Registration Statement, the Company will provide a CUSIP number for the Initial Securities, the Exchange Securities or the Private Exchange Securities, as the case may be, and provide the applicable trustee with printed certificates for the Initial Securities, the Exchange Securities or the Private Exchange Securities, as the case may be, in a form eligible for deposit with The Depository Trust Company.

     (l) The Company will comply with all rules and regulations of the Commission to the extent and so long as they are applicable to the Registered Exchange Offer or the Shelf Registration and will make generally available to its security holders (or otherwise provide in accordance with Section 11(a) of the Securities Act) an earnings statement satisfying the provisions of Section 11(a) of the Securities Act, no later than 45 days after the end of a 12-month period (or 90 days, if such period is a fiscal year) beginning with the first month of the Company’s first fiscal quarter commencing after the effective date of the Registration Statement, which statement shall cover such 12-month period.

     (m) The Company shall cause the Indenture to be qualified under the Trust Indenture Act of 1939, as amended, in a timely manner and containing such changes, if any, as shall be

7

necessary for such qualification. In the event that such qualification would require the appointment of a new trustee under the Indenture, the Company shall appoint a new trustee thereunder pursuant to the applicable provisions of the Indenture.

     (n) The Company may require each Holder of Securities to be sold pursuant to the Shelf Registration Statement to furnish to the Company such information regarding the Holder and the distribution of the Securities as the Company may from time to time reasonably require for inclusion in the Shelf Registration Statement, and the Company may exclude from such registration the Securities of any Holder that unreasonably fails to furnish such information within a reasonable time after receiving such request.

     (o) The Company shall enter into such customary agreements (including, if requested, an underwriting agreement in customary form) and take all such other action, if any, as any Holder of the Securities shall reasonably request in order to facilitate the disposition of the Securities pursuant to any Shelf Registration.

     (p) In the case of any Shelf Registration, the Company shall (i) make reasonably available for inspection during regular business hours of the Company by the Holders of the Securities, any underwriter participating in any disposition pursuant to the Shelf Registration Statement and any attorney, accountant or other agent retained by the Holders of the Securities or any such underwriter all relevant financial and other records, pertinent corporate documents and properties of the Company and (ii) cause the Company’s officers, directors, employees, accountants and auditors to supply all relevant information reasonably requested by the Holders of the Securities or any such underwriter, attorney, accountant or agent in connection with the Shelf Registration Statement, in each case, as shall be reasonably necessary to enable such persons, to conduct a reasonable investigation within the meaning of Section 11 of the Securities Act; provided, however, that the foregoing inspection and information gathering shall be coordinated on behalf of the Purchaser by you and on behalf of the other parties, by one counsel designated by and on behalf of such other parties as described in Section 4 hereof.

     (q) In the case of any Shelf Registration, the Company, if requested by any Holder of Securities covered thereby, shall cause (i) its counsel to deliver an opinion and updates thereof relating to the Securities in customary form addressed to such Holders and the managing underwriters, if any, thereof and dated, in the case of the initial opinion, the effective date of such Shelf Registration Statement (it being agreed that the matters to be covered by such opinion shall include, without limitation, the due incorporation and good standing of the Company and its subsidiaries; the qualification of the Company and its subsidiaries to transact business as foreign corporations; the due authorization, execution and delivery of the relevant agreement of the type referred to in Section 3(o) hereof; the due authorization, execution, authentication and issuance, and the validity and enforceability, of the applicable Securities; the absence of material legal or governmental proceedings involving the Company and its subsidiaries; the absence of governmental approvals required to be obtained in connection with the Shelf Registration Statement, the offering and sale of the applicable Securities, or any agreement of the type referred to in Section 3(o) hereof; the compliance as to form of such Shelf Registration Statement and any documents incorporated by reference therein and of the Indenture with the requirements of the Securities Act and the Trust Indenture Act, respectively; and (A) as of the date of the opinion and as of the effective date of the Shelf Registration Statement or most recent post-effective amendment thereto, as the case may be, the absence from such Shelf Registration Statement and the prospectus included therein, as then amended or supplemented, and from any documents incorporated by reference therein and (B) as of an applicable time identified by such Holders or managing underwriters, the absence from such prospectus taken together with any other documents identified by such Holders or managing underwriters, in the case of (A) and (B), of an untrue statement of a material fact or the omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading (in the case of any such

8

incorporated documents, in the light of the circumstances existing at the time that such documents were filed with the Commission under the Exchange Act); (ii) its officers to execute and deliver all customary documents and certificates and updates thereof requested by any underwriters of the applicable Securities and (iii) its independent public accountants to provide to the selling Holders of the applicable Securities and any underwriter therefor a comfort letter in customary form and covering matters of the type customarily covered in comfort letters in connection with primary underwritten offerings, subject to receipt of appropriate documentation as contemplated, and only if permitted, by Statement of Auditing Standards No. 72.

     (r) In the case of the Registered Exchange Offer, if requested by the Purchaser or any known Participating Broker-Dealer, the Company shall cause (i) its counsel to deliver to the Purchaser or such Participating Broker-Dealer a signed opinion in the form set forth in Section 7(c) of the Purchase Agreement with such changes as are customary in connection with the preparation of a Registration Statement and (ii) its independent public accountants to deliver to the Purchaser or such Participating Broker-Dealer a comfort letter, in customary form, meeting the requirements as to the substance thereof as set forth in Section 7(a) of the Purchase Agreement, with appropriate date changes.

     (s) If a Registered Exchange Offer or a Private Exchange is to be consummated, upon delivery of the Initial Securities by Holders to the Company (or to such other Person as directed by the Company) in exchange for the Exchange Securities or the Private Exchange Securities, as the case may be, the Company shall mark, or caused to be marked, on the Initial Securities so exchanged that such Initial Securities are being canceled in exchange for the Exchange Securities or the Private Exchange Securities, as the case may be; in no event shall the Initial Securities be marked as paid or otherwise satisfied.

     (t) The Company will use its reasonable best efforts to (a) if the Initial Securities have been rated prior to the initial sale of such Initial Securities, confirm such ratings will apply to the Securities covered by a Registration Statement, or (b) if the Initial Securities were not previously rated, cause the Securities covered by a Registration Statement to be rated with the appropriate rating agencies, if so requested by Holders of a majority in aggregate principal amount of Securities covered by such Registration Statement, or by the managing underwriters, if any.

     (u) In the event that any broker-dealer registered under the Exchange Act shall underwrite any Securities or participate as a member of an underwriting syndicate or selling group or “assist in the distribution” (within the meaning of the Conduct Rules (the “Rules”) of the National Association of Securities Dealers, Inc. (“NASD”)) thereof, whether as a Holder of such Securities or as an underwriter, a placement or sales agent or a broker or dealer in respect thereof, or otherwise, the Company will assist such broker-dealer in complying with the requirements of such Rules, including, without limitation, by (i) if such Rules, including Rule 2720, shall so require, engaging a “qualified independent underwriter” (as defined in Rule 2720) to participate in the preparation of the Registration Statement relating to such Securities, to exercise usual standards of due diligence in respect thereto and, if any portion of the offering contemplated by such Registration Statement is an underwritten offering or is made through a placement or sales agent, to recommend the yield of such Securities, (ii) indemnifying any such qualified independent underwriter to the extent of the indemnification of underwriters provided in Section 5 hereof and (iii) providing such information to such broker-dealer as may be required in order for such broker-dealer to comply with the requirements of the Rules.

     (v) The Company shall use its reasonable best efforts to take all other steps necessary to effect the registration of the Securities covered by a Registration Statement contemplated hereby.

     4. Registration Expenses. The Company shall bear all fees and expenses incurred in connection with the performance of its obligations under Sections 1 through 3 hereof (including the reasonable fees

9

and expenses, if any, of Cravath, Swaine & Moore LLP, counsel for the Purchaser, incurred in connection with the Registered Exchange Offer), whether or not the Registered Exchange Offer or a Shelf Registration is filed or becomes effective, and, in the event of a Shelf Registration, shall bear or reimburse the Holders of the Securities covered thereby for the reasonable fees and disbursements of one firm of counsel designated by the Holders of a majority in principal amount of the Initial Securities covered thereby to act as counsel for the Holders of the Initial Securities in connection therewith.

     5. Indemnification. (a) The Company agrees to indemnify and hold harmless each Holder of the Securities, any Participating Broker-Dealer and each person, if any, who controls such Holder or such Participating Broker-Dealer within the meaning of the Securities Act or the Exchange Act (each Holder, any Participating Broker-Dealer and such controlling persons are referred to collectively as the “Indemnified Parties”) from and against any losses, claims, damages or liabilities, joint or several, or any actions in respect thereof (including, but not limited to, any losses, claims, damages, liabilities or actions relating to purchases and sales of the Securities) to which each Indemnified Party may become subject under the Securities Act, the Exchange Act or otherwise, insofar as such losses, claims, damages, liabilities or actions arise out of or are based upon any untrue statement or alleged untrue statement of a material fact contained in a Registration Statement or prospectus or in any amendment or supplement thereto or in any preliminary prospectus or “issuer free writing prospectus,” as defined in Commission Rule 433 (“Issuer FWP”), relating to a Shelf Registration, or arise out of, or are based upon, the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, and shall reimburse, as incurred, the Indemnified Parties for any legal or other expenses reasonably incurred by them in connection with investigating or defending any such loss, claim, damage, liability or action in respect thereof; provided, however, that (i) the Company shall not be liable in any such case to the extent that such loss, claim, damage or liability arises out of or is based upon any untrue statement or alleged untrue statement or omission or alleged omission made in a Registration Statement or prospectus or in any amendment or supplement thereto or in any preliminary prospectus or Issuer FWP relating to a Shelf Registration in reliance upon and in conformity with written information pertaining to such Holder and furnished to the Company by or on behalf of such Holder specifically for inclusion therein and (ii) with respect to any untrue statement or omission or alleged untrue statement or omission made in any preliminary prospectus relating to a Shelf Registration Statement, the indemnity agreement contained in this subsection (a) shall not inure to the benefit of any Holder or Participating Broker-Dealer from whom the person asserting any such losses, claims, damages or liabilities purchased the Securities concerned, to the extent that a prospectus relating to such Securities was required to be delivered (including through satisfaction of the conditions of Commission Rule 172) by such Holder or Participating Broker-Dealer under the Securities Act in connection with such purchase and any such loss, claim, damage or liability of such Holder or Participating Broker-Dealer results from the fact that there was not conveyed to such person, at or prior to the time of the sale of such Securities to such person, an amended or supplemented prospectus or, if permitted by Section 3(d), an Issuer FWP correcting such untrue statement or omission or alleged untrue statement or omission if the Company had previously furnished copies thereof to such Holder or Participating Broker-Dealer; provided further, however, that this indemnity agreement will be in addition to any liability which the Company may otherwise have to such Indemnified Party. The Company shall also indemnify underwriters, their officers and directors and each person who controls such underwriters within the meaning of the Securities Act or the Exchange Act to the same extent as provided above with respect to the indemnification of the Holders of the Securities if requested by such Holders.

     (b) Each Holder of the Securities, severally and not jointly, will indemnify and hold harmless the Company and each person, if any, who controls the Company within the meaning of the Securities Act or the Exchange Act from and against any losses, claims, damages or liabilities or any actions in respect thereof, to which the Company or any such controlling person may become subject under the Securities Act, the Exchange Act or otherwise, insofar as such losses, claims, damages, liabilities or actions arise out of or are based upon any untrue statement or alleged untrue statement of a material fact contained in a Registration Statement or prospectus or in any amendment or supplement thereto or in any preliminary prospectus or Issuer FWP relating to a Shelf Registration, or arise out of or are based upon the omission or

10

alleged omission to state therein a material fact necessary to make the statements therein not misleading, but in each case only to the extent that the untrue statement or omission or alleged untrue statement or omission was made in reliance upon and in conformity with written information pertaining to such Holder and furnished to the Company by or on behalf of such Holder specifically for inclusion therein; and, subject to the limitation set forth immediately preceding this clause, shall reimburse, as incurred, the Company for any legal or other expenses reasonably incurred by the Company or any such controlling person in connection with investigating or defending any loss, claim, damage, liability or action in respect thereof. This indemnity agreement will be in addition to any liability which such Holder may otherwise have to the Company or any of its controlling persons.

     (c) Promptly after receipt by an indemnified party under this Section 5 of notice of the commencement of any action or proceeding (including a governmental investigation), such indemnified party will, if a claim in respect thereof is to be made against the indemnifying party under this Section 5, notify the indemnifying party of the commencement thereof; but the failure to notify the indemnifying party shall not relieve the indemnifying party from any liability that it may have under subsection (a) or (b) above except to the extent that it has been materially prejudiced (through the forfeiture of substantive rights or defenses) by such failure; and provided further that the failure to notify the indemnifying party shall not relieve it from any liability that it may have to an indemnified party otherwise than under subsection (a) or (b) above. In case any such action is brought against any indemnified party, and it notifies the indemnifying party of the commencement thereof, the indemnifying party will be entitled to participate therein and, to the extent that it may wish, jointly with any other indemnifying party similarly notified, to assume the defense thereof, with counsel reasonably satisfactory to such indemnified party (who shall not, except with the consent of the indemnified party, be counsel to the indemnifying party), and after notice from the indemnifying party to such indemnified party of its election so to assume the defense thereof the indemnifying party will not be liable to such indemnified party under this Section 5 for any legal or other expenses, other than reasonable costs of investigation, subsequently incurred by such indemnified party in connection with the defense thereof. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement of any pending or threatened action in respect of which any indemnified party is or could have been a party and indemnity could have been sought hereunder by such indemnified party unless such settlement (i) includes an unconditional release of such indemnified party from all liability on any claims that are the subject matter of such action, and (ii) does not include a statement as to or an admission of fault, culpability or a failure to act by or on behalf of any indemnified party.

     (d) If the indemnification provided for in this Section 5 is unavailable or insufficient to hold harmless an indemnified party under subsections (a) or (b) above, then each indemnifying party shall contribute to the amount paid or payable by such indemnified party as a result of the losses, claims, damages or liabilities (or actions in respect thereof) referred to in subsection (a) or (b) above (i) in such proportion as is appropriate to reflect the relative benefits received by the indemnifying party or parties on the one hand and the indemnified party on the other from the exchange of the Securities, pursuant to the Registered Exchange Offer, or (ii) if the allocation provided by the foregoing clause (i) is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the indemnifying party or parties on the one hand and the indemnified party on the other in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities (or actions in respect thereof) as well as any other relevant equitable considerations. The relative fault of the parties shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company on the one hand or such Holder or such other indemnified party, as the case may be, on the other, and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The amount paid by an indemnified party as a result of the losses, claims, damages or liabilities referred to in the first sentence of this subsection (d) shall be deemed to include any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any action or claim which is the subject of this subsection (d). Notwithstanding any other provision of this Section 5(d), the Holders of the

11

Securities shall not be required to contribute any amount in excess of the amount by which the net proceeds received by such Holders from the sale of the Securities pursuant to a Registration Statement exceeds the amount of damages which such Holders have otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. For purposes of this paragraph (d), each person, if any, who controls such indemnified party within the meaning of the Securities Act or the Exchange Act shall have the same rights to contribution as such indemnified party and each person, if any, who controls the Company within the meaning of the Securities Act or the Exchange Act shall have the same rights to contribution as the Company.

     (e) The agreements contained in this Section 5 shall survive the sale of the Securities pursuant to a Registration Statement and shall remain in full force and effect, regardless of any termination or cancellation of this Agreement or any investigation made by or on behalf of any indemnified party.

     6. Additional Interest Under Certain Circumstances. Additional interest (the “Additional Interest”) with respect to the Initial Securities shall be assessed as follows if any of the following events occur (each such event in clauses (i) through (iii) below a “Registration Default”):

     (i) If the Exchange Offer is not consummated on or before the 240^th day after the Issue Date;

     (ii) If obliged to file a Shelf Registration Statement, the Shelf Registration Statement is not declared effective on or prior to the 360^th day after the Issue Date; or

     (iii) If after either the Exchange Offer Registration Statement or the Shelf Registration Statement is declared (or becomes automatically) effective (A) such Registration Statement thereafter ceases to be effective; or (B) such Registration Statement or the related prospectus ceases to be usable (except as permitted in paragraph (b)) in connection with resales of Transfer Restricted Securities during the periods specified herein because either (1) any event occurs as a result of which the related prospectus forming part of such Registration Statement would include any untrue statement of a material fact or omit to state any material fact necessary to make the statements therein in the light of the circumstances under which they were made not misleading, (2) it shall be necessary to amend such Registration Statement or supplement the related prospectus, to comply with the Securities Act or the Exchange Act or the respective rules thereunder, or (3) such Registration Statement is a Shelf Registration Statement that has expired before a replacement Shelf Registration Statement has become effective.

Additional Interest shall accrue on the Initial Securities over and above the interest set forth in the title of the Securities from and including the date on which any such Registration Default shall occur to but excluding the date on which all such Registration Defaults have been cured, (i) so long as the Company is subject to, and complies with, the periodic reporting requirements of the Exchange Act, subject to Rule 12b-25 of the Exchange Act, at a rate of 0.25% per annum for the first 90-day period immediately following the occurrence of a Registration Default, and such rate will increase by an additional 0.25% per annum with respect to each subsequent 90-day period until all Registration Defaults have been cured, up to a maximum additional interest rate of 1.0% per annum and (ii) otherwise, at a rate of 0.50% per annum for the first 90-day period immediately following the occurrence of a Registration Default, and such rate will increase by an additional 0.50% per annum with respect to each subsequent 90-day period until all Registration Defaults have been cured, up to a maximum additional interest rate of 2.0% per annum. The Company will not be required to pay any Additional Interest during any Shelf Suspension Period and after the Company cures such Registration Default.

     (b) A Registration Default referred to in Section 6(a)(iii)(B) hereof shall be deemed not to have occurred and be continuing in relation to a Shelf Registration Statement or the related prospectus if (i) such

12

Registration Default has occurred solely as a result of (x) the filing of a post-effective amendment to such Shelf Registration Statement to incorporate annual audited financial information with respect to the Company where such post-effective amendment is not yet effective and needs to be declared effective to permit Holders to use the related prospectus or (y) other material events, with respect to the Company that would need to be described in such Shelf Registration Statement or the related prospectus and (ii) in the case of clause (y), the Company is proceeding promptly and in good faith to amend or supplement such Shelf Registration Statement and related prospectus to describe such events; provided, however, that in any case if such Registration Default occurs for a continuous period in excess of 30 days, Additional Interest shall be payable in accordance with the above paragraph from the day such Registration Default occurs until such Registration Default is cured.

     (c) Any amounts of Additional Interest due pursuant to Section 6(a) above will be payable in cash on the regular interest payment dates with respect to the Initial Securities. The amount of Additional Interest will be determined by multiplying the applicable Additional Interest rate by the principal amount of the Initial Securities, multiplied by a fraction, the numerator of which is the number of days such Additional Interest rate was applicable during such period (determined on the basis of a 360-day year comprised of twelve 30-day months), and the denominator of which is 360.

     (d) “Transfer Restricted Securities” means each Security until (i) the date on which such Transfer Restricted Security has been exchanged by a person other than a broker-dealer for a freely transferable Exchange Security in the Registered Exchange Offer, (ii) following the exchange by a broker-dealer in the Registered Exchange Offer of a Initial Security for an Exchange Note, the date on which such Exchange Note is sold to a purchaser who receives from such broker-dealer on or prior to the date of such sale a copy of the prospectus contained in the Exchange Offer Registration Statement, (iii) the date on which such Initial Security has been effectively registered under the Securities Act and disposed of in accordance with the Shelf Registration Statement or (iv) the date on which such Initial Securities is distributed to the public pursuant to Rule 144 under the Securities Act or is saleable pursuant to Rule 144(k) under the Securities Act.

     7. Rules 144 and 144A. The Company shall use reasonable efforts to file the reports required to be filed by it under the Securities Act and the Exchange Act in a timely manner and, if at any time the Company is not required to file such reports, it will, upon the request of any Holder of Initial Securities, make publicly available other information so long as necessary to permit sales of their securities pursuant to Rules 144 and 144A unless the Company furnishes said Holder with a certificate of an officer stating that in the officer’s good faith judgment it would be seriously detrimental to the Company to disclose such information publicly at such time, in which event the Company shall have the right to defer disclosing such information for a period of not more than ninety (90) days after receipt of a request from such Holder to disclose such information; provided however that the Company shall not utilize this right more than once in any twelve (12) month period. The Company covenants that it will take such further action as any Holder of Initial Securities may reasonably request, all to the extent required from time to time to enable such Holder to sell Initial Securities without registration under the Securities Act within the limitation of the exemptions provided by Rules 144 and 144A (including the requirements of Rule 144A(d)(4)). The Company will provide a copy of this Agreement to prospective purchasers of Initial Securities identified to the Company by the Purchaser upon request. Upon the request of any Holder of Initial Securities, the Company shall deliver to such Holder a written statement as to whether it has complied with the requirements of this Section 7 unless at the time there exists a good faith dispute whether the Company or the Holder have complied in all material respects with the terms and conditions of this Section 7. Notwithstanding the foregoing, nothing in this Section 7 shall be deemed to require the Company to register any of its securities pursuant to the Exchange Act.

     8. Underwritten Registrations. If any of the Transfer Restricted Securities covered by any Shelf Registration are to be sold in an underwritten offering, the investment banker or investment bankers and manager or managers that will administer the offering (“Managing Underwriters”) will be selected by the

13

Holders of a majority in aggregate principal amount of such Transfer Restricted Securities to be included in such offering.

     No person may participate in any underwritten registration hereunder unless such person (i) agrees to sell such person’s Transfer Restricted Securities on the basis reasonably provided in any underwriting arrangements approved by the persons entitled hereunder to approve such arrangements and (ii) completes and executes all questionnaires, powers of attorney, indemnities, underwriting agreements and other documents reasonably required under the terms of such underwriting arrangements.

     9. Miscellaneous.

     (a) Amendments and Waivers. The provisions of this Agreement may not be amended, modified or supplemented, and waivers or consents to departures from the provisions hereof may not be given, except by the Company and the written consent of the Holders of a majority in principal amount of the Securities affected by such amendment, modification, supplement, waiver or consents.

     (b) Notices. All notices and other communications provided for or permitted hereunder shall be made in writing by hand delivery, first-class mail, facsimile transmission, or air courier which guarantees overnight delivery:

          (1) if to a Holder of the Securities, at the most current address given by such Holder to the Company.

          (2) if to the Purchaser;

Credit Suisse Securities (USA) LLC

Eleven Madison Avenue

New York, NY 10010-3629

Fax No.: (212) 325-4296

Attention: Transactions Advisory Group

          with a copy to:

Cravath, Swaine & Moore LLP

825 Eighth Avenue

Worldwide Plaza

New York, NY 10019

Fax No.: (212) 474-3700

Attention: William J. Whelan, Esq.

          (3) if to the Company, at its address as follows:

Alion Science and Technology Corporation

1750 Tysons Boulevard

McLean, Virginia 22102

Attention: General Counsel

          with a copy to:

Baker & McKenzie

815 Connecticut Avenue, NW

Washington, DC 20006-4078

Attention: David S. Cole, Esq.

14

     All such notices and communications shall be deemed to have been duly given: at the time delivered by hand, if personally delivered; three business days after being deposited in the mail, postage prepaid, if mailed; when receipt is acknowledged by recipient’s facsimile machine operator, if sent by facsimile transmission; and on the day delivered, if sent by overnight air courier guaranteeing next day delivery.

     (c) No Inconsistent Agreements. The Company has not, as of the date hereof, entered into, nor shall it, on or after the date hereof, enter into, any agreement with respect to its securities that is inconsistent with the rights granted to the Holders herein or otherwise conflicts with the provisions hereof.

     (d) Successors and Assigns. This Agreement shall be binding upon the Company and its successors and assigns.

     (e) Counterparts. This Agreement may be executed in any number of counterparts and by the parties hereto in separate counterparts, each of which when so executed shall be deemed to be an original and all of which taken together shall constitute one and the same agreement.

     (f) Headings. The headings in this Agreement are for convenience of reference only and shall not limit or otherwise affect the meaning hereof.

     (g) Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO PRINCIPLES OF CONFLICTS OF LAWS.

     (h) Severability. If any one or more of the provisions contained herein, or the application thereof in any circumstance, is held invalid, illegal or unenforceable, the validity, legality and enforceability of any such provision in every other respect and of the remaining provisions contained herein shall not be affected or impaired thereby.

     (i) Securities Held by the Company. Whenever the consent or approval of Holders of a specified percentage of principal amount of Securities is required hereunder, Securities held by the Company or its affiliates (other than subsequent Holders of Securities if such subsequent Holders are deemed to be affiliates solely by reason of their holdings of such Securities) shall not be counted in determining whether such consent or approval was given by the Holders of such required percentage.

15

     If the foregoing is in accordance with your understanding of our agreement, please sign and return to the Company a counterpart hereof, whereupon this instrument, along with all counterparts, will become a binding agreement among the Purchaser, the Issuer and each of the Guarantors in accordance with its terms.

Very truly yours, ALION SCIENCE AND TECHNOLOGY CORPORATION
By:	/s/ John M. Hughes
	Title: Executive VP and CFO

HUMAN FACTORS APPLICATIONS, INC.,
By:	/s/ John M. Hughes
	Title: Treasurer

ALION-METI CORPORATION,
By:	/s/ John M. Hughes
	Title: Treasurer

ALION-CATI CORPORATION,
By:	/s/ John M. Hughes
	Title: Treasurer

ALION-JJMA CORPORATION,
By:	/s/ John M. Hughes
	Title: Treasurer

ALION-BMH CORPORATION,
By:	/s/ John M. Hughes
	Title: Treasurer

WASHINGTON CONSULTING, INC.,
By:	/s/ John M. Hughes
	Title: Treasurer

ALION-MA&D CORPORATION,
By:	/s/ John M. Hughes
	Title: Treasurer

16

The foregoing Registration
Rights Agreement is hereby confirmed
and accepted as of the date first
above written.

by: Credit Suisse Securities (USA) LLC

By:	/s/ Malcolm Price
	Name:  Malcolm Price
	Title:  Managing Director

17

ANNEX A

     Each broker-dealer that receives Exchange Securities for its own account pursuant to the Exchange Offer must acknowledge that it will deliver a prospectus in connection with any resale of such Exchange Securities. The Letter of Transmittal states that by so acknowledging and by delivering a prospectus, a broker-dealer will not be deemed to admit that it is an “underwriter” within the meaning of the Securities Act. This Prospectus, as it may be amended or supplemented from time to time, may be used by a broker-dealer in connection with resales of Exchange Securities received in exchange for Initial Securities where such Initial Securities were acquired by such broker-dealer as a result of market-making activities or other trading activities. The Company has agreed that, for a period of 180 days after the Expiration Date (as defined herein), it will make this Prospectus available to any broker-dealer for use in connection with any such resale. See “Plan of Distribution.”

ANNEX B

     Each broker-dealer that receives Exchange Securities for its own account in exchange for Securities, where such Initial Securities were acquired by such broker-dealer as a result of market-making activities or other trading activities, must acknowledge that it will deliver a prospectus in connection with any resale of such Exchange Securities. See “Plan of Distribution.”

ANNEX C

PLAN OF DISTRIBUTION

     Each broker-dealer that receives Exchange Securities for its own account pursuant to the Exchange Offer must acknowledge that it will deliver a prospectus in connection with any resale of such Exchange Securities. This Prospectus, as it may be amended or supplemented from time to time, may be used by a broker-dealer in connection with resales of Exchange Securities received in exchange for Initial Securities where such Initial Securities were acquired as a result of market-making activities or other trading activities. The Company has agreed that, for a period of 180 days after the Expiration Date, it will make this prospectus, as amended or supplemented, available to any broker-dealer for use in connection with any such resale. In addition, until         , 2007, all dealers effecting transactions in the Exchange Securities may be required to deliver a prospectus.⁽¹⁾

     The Company will not receive any proceeds from any sale of Exchange Securities by broker-dealers. Exchange Securities received by broker-dealers for their own account pursuant to the Exchange Offer may be sold from time to time in one or more transactions in the over-the-counter market, in negotiated transactions, through the writing of options on the Exchange Securities or a combination of such methods of resale, at market prices prevailing at the time of resale, at prices related to such prevailing market prices or negotiated prices. Any such resale may be made directly to purchasers or to or through brokers or dealers who may receive compensation in the form of commissions or concessions from any such broker-dealer or the purchasers of any such Exchange Securities. Any broker-dealer that resells Exchange Securities that were received by it for its own account pursuant to the Exchange Offer and any broker or dealer that participates in a distribution of such Exchange Securities may be deemed to be an “underwriter” within the meaning of the Securities Act and any profit on any such resale of Exchange Securities and any commission or concessions received by any such persons may be deemed to be underwriting compensation under the Securities Act. The Letter of Transmittal states that, by acknowledging that it will deliver and by delivering a prospectus, a broker-dealer will not be deemed to admit that it is an “underwriter” within the meaning of the Securities Act.

     For a period of 180 days after the Expiration Date the Company will promptly send additional copies of this Prospectus and any amendment or supplement to this Prospectus to any broker-dealer that requests such documents in the Letter of Transmittal. The Company has agreed to pay all expenses incident to the Exchange Offer (including the expenses of one counsel for the Holders of the Securities) other than commissions or concessions of any brokers or dealers and will indemnify the Holders of the Securities (including any broker-dealers) against certain liabilities, including liabilities under the Securities Act.

⁽¹⁾ In addition, the legend required by Item 502(e) of Regulation S-K will appear on the back cover page of the Exchange Offer prospectus.

ANNEX D

o CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10 ADDITIONAL COPIES OF THE PROSPECTUS AND 10 COPIES OF ANY AMENDMENTS OR SUPPLEMENTS THERETO.

Name:

Address:  

If the undersigned is not a broker-dealer, the undersigned represents that it is not engaged in, and does not intend to engage in, a distribution of Exchange Securities. If the undersigned is a broker-dealer that will receive Exchange Securities for its own account in exchange for Initial Securities that were acquired as a result of market-making activities or other trading activities, it acknowledges that it will deliver a prospectus in connection with any resale of such Exchange Securities; however, by so acknowledging and by delivering a prospectus, the undersigned will not be deemed to admit that it is an “underwriter” within the meaning of the Securities Act.