ManTech International Corporation (Nasdaq:MANT), a leading provider of technical and engineering services and solutions vital to the nation’s interest and security, will issue its fourth quarter fiscal year 2010 earnings press release after close of market Wednesday, February 24, 2010. Management will discuss the financial results and outlook for fiscal year 2010 in a conference call beginning at 5 p.m. Eastern.

Analysts and institutional investors may participate on the conference call by dialing (888) 791-4324 (domestic) or (913) 981-4904 (international) and entering passcode 8846208. The conference call will be webcast simultaneously to the public through a link on the Investor Relations section of the ManTech web site ( www.mantech.com).

A replay of the conference call will be available by telephone approximately one hour after conclusion of the call through March 10, 2010 by dialing (888) 203-1112 (domestic) or (719) 457-0820 (international) and entering passcode 8846208. In addition, a replay of the webcast will be available on the ManTech web site approximately two hours after the conclusion of the conference call.

About ManTech International Corporation:

Headquartered in Fairfax, Virginia with approximately 8,600 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; and other U.S. federal government customers. ManTech's expertise includes systems engineering and integration, enterprise architecture, cyber security/information assurance, social business collaboration, intelligence operations and analysis support, network and critical infrastructure protection, information operations and information warfare support, information technology, communication integration, global logistics and supply chain management, and service oriented architecture. The company operates in the United States and 40 countries. Additional information on ManTech can be found at www.mantech.com.

Forward-Looking Information:

Statements in this announcement, other than historical data and information, constitute forward-looking statements that involve risks and uncertainties. A number of factors could cause our actual results, performance, achievements, or industry results to be very different from the results, performance, or achievements expressed or implied by such forward-looking statements. Some of these factors include, but are not limited to, the risk factors set forth in ManTech's Annual Report on Form 10-K for the period ended December 31, 2008, and other such filings that ManTech makes with the SEC from time to time. Due to such uncertainties and risks, readers are cautioned not to place undue reliance on such forward-looking statements, which speak only as of the date hereof.

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