It
greatly expands our presence in homeland security related missions and
meshes very well with our high-end offerings for the Intelligence
Community and Department of Defense.S. These and other risk factors
are more fully discussed in the section entitled "Risks Related to the
Company's Business" in ManTech's Annual Report on Form 10-K filed with
the Securities and Exchange Commission on March 16, 2005, and, from
time to time , in ManTech's other filings with the Securities and
Exchange Commission, including among others, its reports on Form 8-K
and Form 10-Q.

affairs missions

Such forward-looking statements include, but are not limited to, the
impact of the transaction on 2005 revenues and EPS, the opportunity
for substantial future tax benefits, and ManTech's ability to
successfully integrate the operations of Gray Hawk Systems, Inc.

department foreign

, after the expiration of the
waiting period under the Hart-Scott-Rodino Antitrust Improvements Act
of 1976. Additional information on ManTech
can be found at www.

asia indonesia

ManTech Completes Acquisition of Gray Hawk Systems

About 75 percent of their customers are in homeland
security related businesses and the remaining quarter in the
Department of Defense and Intelligence Community . Department of Homeland Security; and is helping the
Department of Justice's U. Marshals Service deploy a common, office
automation system.S.
The forward-looking statements included in this news release are
only made as of the date of this news release and ManTech undertakes
no obligation to publicly update any of the forward-looking statements
made herein, whether as a result of new information, subsequent events
or circumstances, changes in expectations or otherwise.

from indonesia

More than 90 percent of the
company's 500 employees are cleared, with 70 percent at higher level
clearances .S.
ManTech's expertise includes systems engineering, systems integration,
technology and software development, enterprise security architecture,
information assurance, intelligence operations support , network and
critical infrastructure protection, information technology,
communications integration and engineering support.S. With 2004 annual revenues of $842 million and
approximately 6,000 highly qualified employees, the company operates
in the United States and 40 countries worldwide. In 2004 , ManTech was
selected by Business Week magazine as one of the Top 100 Hot Growth
Companies and ranked by VARBusiness magazine as one of its Top 50
Fastest-Growing Solution Providers.7 million dollars
over a five year period.

embassies list

Robert A. government spending priorities; failure to
retain existing U. government contracts; risks associated with complex
U. government procurement laws and regulations; failure to
experience favorable results from acquisition synergies; risks of
contract termination, either for default or for the convenience of the
U.

list indonesia

S. Under this new contract The Analysis Corporation
will provide Watch-Standing services on a 24 hour a day, 7 days a week basis
to the Bureau of Intelligence and Research to provide embassies, consulates
and border security officers with critical homeland security-related
information.

consulates regional

federal government customers. embassies all over the
world; has developed a secure, collaborative communications system for
the U.

The Analysis Corporation Wins $3.7 Million Dollar Contract With the Department of State

FAIRFAX, Va., The Analysis Corporation (TAC), a
leading provider of counter-terrorism and anti-crime systems and services , has
been awarded a contract with the Department of State for $3.

regional department

Business Editors/Defense Writers/Government Writers/Technology
Editors

FAIRFAX, Va.S.

The Analysis Corporation at State
Since 1990, The Analysis Corporation has worked with the Department of
State in developing information support systems, staffing of analysts and on-
going maintenance for the State Department 's Bureau of Intelligence and
Research. The Secretary of State described the systems and support previously
provided by The Analysis Corporation as a "national treasure.

from department

Gray Hawk Systems is a profitable , fast-growing, diversified,
high-technology company providing a broad range of intelligence
related services to the homeland security, law enforcement,
Intelligence Community and the Department of Defense markets. Coleman, President and COO, ManTech International
Corporation said, "The Gray Hawk Systems acquisition solidifies our
position as a leading player in the high-end Intelligence market .
These forward-looking statements are subject to known and unknown
risks and uncertainties, which could cause actual results to differ
materially from those anticipated, including, without limitation:
adverse changes in U.S.

official government

Headquartered in Alexandria, VA and founded in 1995, Gray Hawk Systems
had 2004 revenues of approximately $70 million and estimated 2005
revenues of approximately $90 million.mantech. government contracts or win new contracts;
failure to obtain option awards, task orders, or funding under
contracts; risks of contract performance; uncertainties specifically
related to discontinued operations; adverse results of U. government
audits of our U.

from official

"

About ManTech International Corporation:

Headquartered in Fairfax, Virginia, ManTech International
Corporation is a leading provider of innovative technologies and
solutions for mission-critical national security programs for the
Intelligence Community and the Departments of Defense, State, Homeland
Security , Justice and other U. Words such as
"may," "will," "intends," "should," "expects," "plans," "projects ,"
"anticipates," "believes," "estimates," "predicts," "potential,"
"continue," or "opportunity ," or the negative of these terms or words
of similar import are intended to identify forward-looking statements.S.

abroad embassies

----ManTech International
Corporation (Nasdaq:MANT), a leading provider of innovative
technologies and solutions focused on mission-critical national
security programs for the Intelligence Community and the Departments
of Defense, State, Homeland Security, Justice and other federal
government customers, today announced that it has completed its
acquisition of Gray Hawk Systems, Inc. As previously announced on May 4, the purchase price was
approximately $100 million. The company
supports the advanced telecommunications systems that are used in
Operation Iraqi Freedom and in other parts of the world; provides the
physical and cyber security to protect U.S.com

Forward-Looking Information:

Statements and assumptions made in this press release, which do
not address historical facts , constitute "forward-looking" statements
that ManTech believes to be within the definition in the Private
Securities Litigation Reform Act of 1995 and involve risks and
uncertainties, many of which are outside of our control.

This award continues the 15 year relationship
between The Analysis Corporation and the Department of State to support its
counter-terrorism mission.

indonesia embassies

Gray Hawk Systems capabilities
round-out ManTech's skills in the end-to-end, Intelligence information
processing cycle, and gives ManTech access to new markets in national
defense agencies, which we believe will become increasingly important
as the Intelligence Reform Act of 2004 continues to unfold.S. government; and material changes in laws or regulations
applicable to the company's businesses ."

About The Analysis Corporation
Since 1990, the agencies and organizations at the forefront of our
nation's effort to deter terrorism and organized crime have relied on The
Analysis Corporation for data-management systems and services that have proven
critical to mission success -. systems that mine and manipulate complex data
in support of traveler screening and terrorist/criminal tracking operations at
the US borders and at diplomatic posts abroad.