Exhibit 99



(10) Each of the New Mountain Funds is a party to an investor rights
     agreement and a shareholders' agreement, each dated as of April 22,
     2005. The investor rights agreement contains a voting agreement that
     provides, among other things and subject to certain conditions, that
     (i) New Mountain Partners II, L.P. is entitled to elect up to a
     majority of the members of the board of directors of the issuer,
     depending upon the percentage of outstanding common stock and Class A
     common stock of the issuer held by the New Mountain Funds (subject to
     the right of Allegheny New Mountain Partners, L.P. to designate one
     director in lieu of a director designated by New Mountain Partners II,
     L.P.); and (ii) the deLaski Shareholders (as described below) are
     entitled to designate up to two members of the board of directors of
     the issuer, depending on the percentage of outstanding common stock of
     the issuer held by the deLaski Shareholders. The agreement provides
     that the New Mountain Funds and the deLaski Shareholders shall each
     vote all of their voting shares to effectuate the election of such
     directors. The deLaski Shareholders consist of Kenneth E. deLaski,
     Donald deLaski, Donald deLaski 2007 Grantor Retained Annuity Trust,
     David deLaski, Edward Grubb and Kathleen Grubb, JTWROS, The Dana Nancy
     deLaski Irrevocable Trust, The Daphne Jean deLaski Irrevocable Trust
     and the Tena Renken deLaski Revocable Trust. The shareholders'
     agreement provides, among other things, that if the New Mountain Funds
     propose to sell all or any portion of their common stock then certain
     parties to the agreement, if requested by the New Mountain Funds,
     agree to sell their shares in amounts proportionate to the sale by the
     New Mountain Funds and, if shareholder approval is required to approve
     such transaction, to vote all of their shares in favor of the
     transaction. In addition, the New Mountain Funds are third-party
     beneficiaries with the right to enforce certain other agreements made
     between the issuer and other shareholders of the issuer, which contain
     provisions similar to those contained in the shareholders' agreement
     as described above. As a result, each of the reporting persons may be
     deemed to be a member of a group pursuant to Rule 13d-5 promulgated
     under the Securities Exchange Act of 1934 (the "Act"). This filing
     should not be deemed an admission that any of the reporting persons
     are, for purposes of Section 13(d) or Section 16 of the Act or
     otherwise, a member of a group, or that any of the reporting persons
     are the beneficial owner of any securities in excess of the amount in
     which the reporting persons have a pecuniary interest therein, and the
     reporting persons disclaim beneficial ownership of any such
     securities.