ManTech International Corporation (NASDAQ: MANT) announced today that it has completed the acquisition of Worldwide Information Network Systems (WINS) for $90 million in cash. WINS provides specialized IT solutions in network and infrastructure engineering, enterprise architecture, cyber security and systems development, software development and integration, and end-user workspace management. The acquisition will enable ManTech to deliver IT services through WINS's prime position on the Defense Intelligence Agency's (DIA) Solutions for Information Technology Enterprises (SITE) contract, an indefinite delivery/indefinite quantity (IDIQ) contract vehicle with a $6.6 billion ceiling and period of performance through 2015. The acquisition is expected to be accretive to ManTech’s earnings per share in 2012.

WINS will become a part of ManTech's Mission, Cyber and Technology Solutions group, led by L. William Varner. Mr. Varner said, “WINS innovative IT capabilities fit well with our existing business. With WINS we will be able to offer our customers more comprehensive solutions to overcome their complex network challenges. We look forward to working with their talented employees to provide continued excellent service to our customers.”

Mr. George J. Pedersen, ManTech Chairman and Chief Executive Officer, said, “We are extremely pleased to be able to complete the acquisition of WINS so quickly and begin incorporating WINS and its extraordinary people into the ManTech family. WINS is a great fit for our strategy of broadening our reach in the growing areas of national-security technology, such as cyber security and systems integration.”

About ManTech International Corporation

ManTech 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, Energy, and Justice including the Federal Bureau of Investigation; the space community; the National Oceanic and Atmospheric Administration; and other U.S. federal government customers. We provide support to critical national security programs for approximately 60 federal agencies through 1,000 current contracts. ManTech's expertise includes command, control, communications, computers, intelligence, surveillance and reconnaissance (C4ISR) lifecycle support, cyber security, global logistics support, intelligence and counter-intelligence support, information technology modernization and sustainment, systems engineering, and test and evaluation. ManTech supports major national missions such as military readiness, terrorist threat detection, information security, and border protection. 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,” “expect,” “intend,” “anticipate,” “believe,” “estimate,” or “continue,” or the negative of these terms or words of similar import are intended to identify forward-looking statements.

These forward-looking statements are inherently subject to risks and uncertainties, and actual results and outcomes may differ materially from the results and outcomes we anticipate. Factors that could cause actual results to differ materially from the results we anticipate, include, but are not limited to, the following: failure to execute or effectively integrate the WINS acquisition; adverse changes in U.S. government spending priorities; failure to retain existing U.S. government contracts, win new contracts or win recompetes; adverse changes in future levels of expenditures for programs we support caused by budgetary pressures facing the federal government and changing mission priorities; failure to obtain option awards, task orders or funding under contracts; failure to maintain strong relationships with other contractors; adverse changes in our mix of contract types; adverse results of U.S. government audits of our government contracts; risk of contract performance, modification or termination; risks associated with complex U.S. government procurement laws and regulations; risks of financing, such as increases in interest rates and restrictions imposed by our outstanding indebtedness, including the ability to meet financial covenants, and risks related to an inability to obtain new or additional financing; 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 previously filed with the Securities and Exchange Commission on Feb. 25, 2011, Item 1A of Part II of our Quarterly Reports on Form 10-Q, and, from time to time, in ManTech’s other filings with the Securities and Exchange Commission.

The forward-looking statements included herein are only made as of the date of this press 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.

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