SI International, Inc., an information technology and network solutions (IT) company,
today announced that the Air Force Space Command (AFSPC) has awarded SI
International an indefinite delivery, indefinite quantity (ID/IQ) contract for
Advisory and Assistance Services and Engineering Technical Assistance
(CAASETA) for Headquarters AFSPC at Peterson Air Force Base, Colorado. The
contract enables SI International to compete with one other large business
contract awardee and two small business contract awardees for task orders
having an aggregate ceiling value of $610 million over a five-year period.

Tasks to be performed under this contract include management and
professional services; studies, analyses and evaluations; and engineering and
technical services.

“Through our longstanding relationship with the Air Force Space Command,
SI International has developed industry-recognized expertise in space systems
acquisitions, military space operations and missile defense to support the Air
Force Space Command mission to defend the United States through the control
and exploitation of space,” said Ray Oleson, Chairman and CEO of SI
International. “We are extremely honored to have been selected by the U.S.
Air Force Space Command to assist in the upgrade, modernization, and
development of current and new systems.” SI International is one of the
largest systems engineering, network, telecommunications and implementations
contractors supporting the Air Force Space Command.

About SI International: SI International, a member of the Russell 2000
index, is a provider of information technology and network solutions (IT)
primarily to the Federal government. The company combines technological and
industry expertise to provide a full spectrum of state-of-the-practice
solutions and services, from design and development to documentation and
operations that assist clients in achieving their missions. More information
about SI International can be found at http://www.si-intl.com.

The above-referenced statements may contain forward-looking statements
that are made pursuant to the safe-harbor provisions of the Private Securities
Litigation Reform Act of 1995. Expressions of future goals and similar
expressions reflecting something other than historical fact are intended to
identify forward-looking statements, but are not the exclusive means of
identifying such statements. These forward-looking statements involve a
number of risks and uncertainties, which are described in SI International,
Inc.’s filings with the Securities and Exchange Commission. These risks and
uncertainties include: differences between authorized amounts and amounts
received by SI International, Inc. under government contracts; government
customers’ failure to exercise options under contracts; changes in federal
government (or other applicable) procurement laws, regulations, policies and
budgets; SI International, Inc.’s ability to attract and retain qualified
personnel; and the important factors discussed in the Risk Factors section of
the annual report on Form 10-K/A filed by SI International, Inc. with the
Securities and Exchange Commission and available directly from the Commission
at http://www.sec.gov. The actual results may differ materially from any
forward-looking statements due to such risks and uncertainties. SI
International, Inc. undertakes no obligations to revise or update any forward-
looking statements in order to reflect events or circumstances that may arise
after the date of this release.

CONTACT: Alan Hill of SI International, +1-703-234-6854 or
alan.hill@si-intl.com.