Anteon Receives $150 Million General Services Administration Enterprise IT Services Contract.

FAIRFAX, Va. -- Anteon International Corporation (NYSE:ANT), a leading information technology and systems engineering and integration company, today announced that it has been awarded a contract by the General Services Administration (GSA) Public Building Service (PBS) Chief Information Officer (CIO) to provide full IT systems life cycle support. Anteon is one of three awardees selected by GSA PBS on this $150 million five-year Blanket Purchase Agreement contract.

"Anteon views the GSA PBS contract as a significant win. This contract is another example of our continued growth of large-scale IT services work in the federal civilian agency market," stated Dan Johnson, Anteon chief operating officer. "With the award of this contract, we look forward to providing the high quality of service and IT expertise that distinguishes Anteon, as we work side-by-side with our government customers."

Anteon will provide GSA PBS with technology services covering all stages of the IT development life cycle including research, engineering, development, maintenance, administration, product acceptance, training, and help desk support. In addition, Anteon will provide GSA PBS with IT program support to include configuration management, feasibility studies, standards and guidelines development, as well as Commercial Off-the-Shelf (COTS) technology evaluation and selection.

The GSA PBS serves as the landlord for the civilian federal government, with a total inventory of over 339 million square feet of workspace that house approximately one million federal employees in 2,000 American communities. The office of the GSA PBS CIO supports enterprise IT services for government-owned buildings across the U.S.

About Anteon

Anteon, headquartered in Fairfax, Virginia, is a leading systems integrator, providing information technology and engineering solutions to the federal government and international sectors. Anteon designs, integrates, maintains and upgrades 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 was founded in 1976 and has grown to currently employ over 8,800 employees in more than 100 offices worldwide. Anteon consistently ranks among the top information technology integrators based on independent surveys, and has been named to the Forbes List of the 400 Best Big Companies in 2005, earning distinction on the Forbes Platinum List. 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. These statements reflect the Company's current beliefs and are based upon information currently available to it. Be advised that developments subsequent to this release are likely to cause these statements to become outdated with the passage of time. The Company does not currently intend, however, to update the guidance provided today prior to its next earnings release.