ManTech Holds Groundbreaking Ceremony for New Location near Aberdeen, Md.

ManTech International Corporation (NASDAQ:MANT) (www.mantech.com), a leading provider of technical and engineering services and solutions vital to the nation's interest and security, is holding a groundbreaking ceremony this afternoon at the construction site of its new location at 4696 Millennium Drive at the Water’s Edge Corporate Campus in Belcamp, Md., near the U.S. Army Aberdeen Proving Ground. The project is led by construction company Manekin LLC, in conjunction with Alex Brown Realty, Inc.

State and local dignitaries scheduled to attend include Honorable C.A. Dutch Ruppersberger, U.S. House of Representatives, Maryland’s 2^nd District; David R. Craig, Harford County Executive; James C. Richardson, Director, Harford County Office of Economic Development; and J. Thomas Sadowski, President and CEO, Economic Alliance of Greater Baltimore.

The new facility will accommodate ManTech’s growing Maryland workforce. The company currently has more than 700 employees in Maryland supporting a number of federal government and U.S. military organizations. When the building opens in March 2011, ManTech will occupy 63,000 square feet of the 125,000-square-foot space. ManTech expects to have 300 to 500 technology jobs at the location in the next three years.

Honorable C.A. Dutch Ruppersberger, U.S. House of Representatives, Maryland’s 2^nd District, said, "Jobs are the gasoline that powers our nation’s economy. When you have a job, you can support your family and your community. Jobs are tough to come by in this challenging economy. It is exciting news to hear that ManTech is expanding and growing its workforce here in Harford County. Maryland prides itself on offering businesses a well-educated, highly skilled workforce. ManTech is tapping into this great resource.”

Harford County Executive David R. Craig said, "Harford County is pleased to see the significant expansion of ManTech’s corporate presence at the Water’s Edge Campus. An increased presence in the Aberdeen area will provide ManTech with ready access to an elite technology workforce, as well as close proximity to its customers within the federal government community.”

"Today’s groundbreaking and our new location reinforce ManTech’s commitment to bringing cutting-edge technology solutions and mission-critical support services to our customers in the federal government,” said ManTech Chairman and Chief Executive Officer George J. Pedersen. "We are extremely pleased to expand our local presence by making a substantial investment in Maryland, adding to our more than 9,000 employees worldwide.”

About ManTech International Corporation

Headquartered in Fairfax, Va., with approximately 9,000 professionals, 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 and Justice; the space community; the National Oceanic and Atmospheric Administration; and other U.S. federal government customers. ManTech's expertise includes systems engineering, systems integration, 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. Additional information on ManTech can be found at www.mantech.com.

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