POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby constitutes and
appoints each of Michael R. Putnam and Jeffrey S. Brown, or either of them
signing singly, and with full power of substitution, the undersigned's true
and lawful attorney in fact to:

(1)	prepare, execute in the undersigned's name and on the undersigned's
behalf, and submit to the U.S. Securities and Exchange Commission the SEC a
Form ID, including amendments thereto, and any other documents necessary or
appropriate to obtain codes and passwords enabling the undersigned to make
electronic filings with the SEC of reports required by Section 16a of the
Securities Exchange Act of 1934 or any rule or regulation of the SEC;

(2)	execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer and/or director of ManTech International Corporation
(the Company), Forms 3 4 and 5 in accordance with Section 16a  of the Securities
Exchange Act of 1934 and the rules thereunder;

(3)		do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete and execute any
such Form 3 4 or 5 complete and execute any amendment or amendments thereto,
and timely file such form with the SEC and any stock exchange
or similar authority; and

(4)	take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney in fact, may be of benefit to,
in the best interest of, or legally required by, the undersigned, it being
understood that the documents executed by such attorney in fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney in fact may approve in
such attorney in fact's discretion.

         	The undersigned hereby grants to each such attorney in fact
full power and authority to do and perform any and every act and thing whatsoever
requisite, necessary, or proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as the undersigned
might or could do if personally present, with full power of substitution or
revocation, hereby ratifying and confirming all that such attorney in fact, or such
attorney in fact's substitute or substitutes, shall lawfully do or cause to be done
by virtue of this power of attorney and the rights and powers herein granted.
The undersigned acknowledges that the foregoing attorneys in fact, in serving in
such capacity at the request of the undersigned, are not assuming, nor is the
Company assuming,any of the undersigned's responsibilities to comply with Section
16 of the Securities Exchange Act of 1934.

         	This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3 4 and 5 with respect
to the undersigned's holdings of and transactions in securities issued by the
Company, unless earlier revoked by the undersigned in a signed writing delivered
to the foregoing attorneys in fact.

         	IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 2 day of August, 2006.


		/s/ John J. Fitzgerald 					Signature

		John J. Fitzgerald			 		Print Name




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