Anteon International Announces Secondary Public Offering of 3.6 Million Shares of Common Stock Currently Owned by Caxton-Iseman Capital and Affiliates.

FAIRFAX, Va. -- Anteon International Corporation, (NYSE:ANT), announced today that it has priced a public offering of 3,600,000 shares of its common stock. The shares are being offered by affiliates of and companies managed by Caxton-Iseman Capital, Inc. in an underwritten public offering under Anteon's existing shelf registration statement. Neither the Company nor any of its executive officers are selling shares in this offering. After giving effect to the sale, affiliates of and companies managed by Caxton-Iseman Capital, Inc. will continue to hold approximately 3,505,490 shares of Anteon common stock registered for sale under the existing registration statement previously filed by the Company with the Securities and Exchange Commission. Anteon will not receive any proceeds from the offering. Anteon International Corporation, Caxton-Iseman Capital, Inc. and certain of its affiliates will be bound by a 90-day lock-up agreement.

Goldman, Sachs & Co. is the sole underwriter on the offering.

A registration statement relating to these securities was filed and declared effective by the Securities and Exchange Commission. The public offering is being made by means of a prospectus. This press release shall not constitute an offer to sell or the solicitation of any offer to buy the securities described above, nor shall there be any sale of these securities in any state in which such an offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such state.

Copies of the final prospectus supplement and related prospectus for the offering, when available, may be obtained by contacting: Goldman, Sachs & Co., 85 Broad Street, New York, NY 10004, [phone].

About Anteon

Anteon, headquartered in Fairfax, Virginia, is a leading information technology, and systems engineering and integration company, providing support to the U.S. federal government and international sectors. For over 28 years, the Company has designed, integrated, maintained and upgraded state-of-the-art systems for national defense, intelligence, emergency response and other high priority government missions. Anteon also provides many of its government clients with the systems analysis, integration and program management skills necessary to manage the development and operations of their mission critical systems. The Company currently has over 8,600 employees in more than 100 offices worldwide. For more information, visit www.anteon.com.

Safe Harbor Statement under the Private Securities Litigation Reform Act of 1995:

The statements contained in this release which are not historical facts are forward-looking statements that are subject to risks and uncertainties that could cause actual results to differ materially from those set forth in, or implied by, forward-looking statements. The Company has tried, whenever possible, to identify these forward-looking statements using words such as "projects," "anticipates," "believes," "estimates," "expects," "plans," "intends," and similar expressions. Similarly, statements herein that describe the Company's business strategy, outlook, objectives, plans, intentions or goals are also forward-looking statements. The risks and uncertainties involving forward-looking statements include the Company's dependence on continued funding of U.S. government programs, government contract procurement and termination risks, including risks associated with bid protests, and other risks described in the Company's Securities and Exchange Commission filings.