ManTech Awarded $23.3M Reliability Engineering Support Services Contract to Support NASA`s Jet Propulsion Laboratory

FAIRFAX, Va.--(Business Wire)--
ManTech International Corporation (Nasdaq:MANT) announced that it was recently
awarded the recompete for the Reliability Engineering Support Services contract
from the NASA Jet Propulsion Laboratory (JPL). The competitively awarded prime
contract, received in the third quarter, is valued at $23.3 million with a
three-year base and two option years.

Services provided by ManTech under the contract include circuit and systems
reliability; modeling, simulation and analysis; dynamics; thermal and structural
analysis; natural space environments; electromagnetic compatibility; problem
failure reporting; probabilistic risk assessment; and product and quality
assurance for the flight projects at JPL.

"We will apply our extensive systems engineering experience and strong knowledge
of the NASA JPL mission to support the customer on this contract," said Larry
Prior, President and COO, ManTech International Corporation. "ManTech is an
industry leader in safety, reliability and quality engineering supporting JPL,
multiple NASA Centers, the National Reconnaissance Office, Missile Defense
Agency, the Navy and the Air Force Space Command."

ManTech`s teammates on the JPL contract include Alejo Engineering, Inc.; Aspen
Products, Inc.; Fettig Research Evaluation Enterprises, Inc.; Fierheller
Engineering Corporation; KG Magnetics, Inc.; Newson Consulting Inc.; Maden
Technologies; Millennium Engineering Integration Co.; MORI Associates, Inc. and
WestWind Engineering Inc.

The Jet Propulsion Laboratory is the lead U.S. center for robotic exploration of
the solar system, and conducts major programs in space-based Earth sciences and
astronomy. JPL spacecraft have visited all of the planets from Mercury to
Neptune.

ManTech has successfully supported many NASA programs including the Hubble Space
Telescope, for which the company received the NASA George M. Low Award and NASA
Goddard Space Flight Center Contractor Excellence Award. ManTech also currently
supports Shuttle launch activities at Cape Canaveral, FL and its NeXolve
subsidiary is building a five-layer sunshield - roughly the size of a tennis
court - for the NASA James Webb Space Telescope, the successor to the Hubble.
ManTech developed the shield using techniques employed in the creation of its
patent-pending, award-winning, thin-film polymer technology.

About ManTech International Corporation:

Headquartered in Fairfax, Virginia with approximately 8,000 professionals,
ManTech International Corporation is a leading provider of innovative
technologies and solutions for mission-critical national security programs for
the Intelligence Community; the departments of Defense, State, Homeland Security
and Justice; the Space Community; National Oceanic and Atmospheric
Administration; and other U.S. federal government customers. ManTech`s expertise
includes systems engineering, systems integration, software development
services, enterprise architecture, cyber security, information assurance,
intelligence operations and analysis support, network and critical
infrastructure protection, information operations and information warfare
support, information technology, communications integration, global logistics
and supply chain management, and service oriented architectures. The company
supports the advanced telecommunications systems that are used in Operation
Iraqi Freedom and in other parts of the world; has developed a secure,
collaborative communications system for the U.S. Department of Homeland
Security; and builds and maintains secure databases that track terrorists. The
company operates in the United States and 40 countries. In 2008, BusinessWeek
magazine chose ManTech for its `InfoTech 100` listing representing the best
performing tech companies in the world; Forbes.com named ManTech as one of the
400 Best Big Companies in the nation; and A-Space, a Web 2.0 enhanced
collaboration tool that ManTech developed for the Intelligence Community was
named one of the Top 50 Inventions of the Year by Time magazine. Also in 2008,
GI Jobs magazine named ManTech a Top Ten Military Friendly Employer for the
third year in a row. Additional information on ManTech can be found at
www.mantech.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. 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.

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. government
spending priorities; failure to retain existing U.S. government contracts, win
new contracts, or win recompetes; adverse results of U.S. government audits of
our government contracts; risks associated with complex U.S. government
procurement laws and regulations; adverse effect of contract consolidations;
risk of contract performance or termination; failure to obtain option awards,
task orders or funding under contracts; adverse changes in our mix of contract
types; failure to successfully integrate recently acquired companies or
businesses into our operations or to realize any accretive or synergistic
effects from such acquisitions; failure to identify, execute or effectively
integrate future acquisitions; risks of financing, such as increases in interest
rates and restrictions imposed by our credit agreement; risks related to an
inability to obtain new or additional financing; and competition. These and
other risk factors are more fully discussed in the section entitled "Risks
Factors" in ManTech's Annual Report on Form 10-K filed with the Securities and
Exchange Commission on February 27, 2009, and, from time to time, in ManTech's
other filings with the Securities and Exchange Commission, including among
others, its reports on Form 10-Q.

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.

ManTech International Corporation
Mark Root
Executive Director, Corp. Communications
off: 703-218-8397; cell: 571-259-1169
mark.root@mantech.com
or
Joseph Cormier
Senior Vice President, Corporate Development
703-218-8258
joe.cormier@mantech.com

Copyright Business Wire 2009