ManTech Completes the Acquisition of DDK Technology Group, Inc.

Expands Cyber Operations Customer Set

FAIRFAX, Va. - March 16 2009 - ManTech International Corporation (Nasdaq:MANT) announced that it closed the acquisition of DDK Technology Group, Inc. (DDK) under the terms of the definitive purchase agreement dated March 13, 2009. DDK is a rapidly growing provider of cyber security to the DoD, with a particular focus on the Naval Criminal Investigative Service (NCIS).

Headquartered in Lanham, MD, DDK is a privately held and highly-specialized company providing cyber intelligence analysis, computer and network forensics and counterterrorism/ counterintelligence support and analysis globally. All of DDK’s employees have high level clearances. ManTech expects the company to generate 2009 revenues of approximately $14 million with solid operating margins.

“This acquisition continues ManTech’s focus on the high-end intelligence arena and expands our footprint in cyber security to NCIS,” said George J. Pedersen, Chairman and CEO, ManTech International Corporation. “DDK is a great company with a proven track record of strong growth, profitability, and commitment to customer service.”

Jerry Donahoe, Managing Partner and Tim Donahoe, President of DDK said, “Our company has grown around our excellent people and the critical mission requirements of our DoD customer base. Combining with ManTech allows DDK to offer broader solutions to our national security client base. Just as important, aligning our culture with ManTech will afford our professionals with expanded career development opportunities.”

The transaction is expected to be accretive to ManTech’s earnings per share in 2009. Financial terms of the transaction were not disclosed. The Company used cash available and borrowings from its senior secured credit facility to finance the acquisition.

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 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 consolidation; 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; 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.

Contacts:
ManTech International Corporation
Joseph Cormier
Senior Vice President, Corporate Development
703-218-8258
joe.cormier@mantech.com

Mark Root
Executive Director, Corporate Communications
703-218-8397; cell: 571-259-1169
mark.root@mantech.com

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