ManTech International Corporation (NASDAQ: MANT) will issue its fourth quarter fiscal year 2011 earnings press release after close of market Wednesday, February 22, 2012. Management will discuss financial results in a conference call beginning at 5 p.m. Eastern.

Analysts may participate in the conference call by dialing 888-690-2873 (domestic) or 913-312-1443 (international) and entering pass code 2870414. The conference call will be webcast simultaneously to the public through a link on the Investor Relations section of the ManTech website (http://investor.mantech.com).

A replay of the conference call will be available by telephone approximately two hours after conclusion of the call through March 7, 2012, by dialing 888-203-1112 (domestic) or 719-457-0820 (international) and entering pass code 2870414. In addition, a replay of the webcast will be available on the ManTech website approximately two hours after the conclusion of the conference call.

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 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/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.

ManTech International Corporation
Media Contact
Lauren Kushin, 703-218-6406
lauren.kushin@mantech.com
or
Investor Relations Contact
Stuart Davis, 703-218-8269
stuart.davis@mantech.com