The federal government has awarded Booz Allen Hamilton a massive $621 million, six-year contract to implement a Department of Homeland Security program aimed at securing federal networks from cyber threats.

Booz Allen has been selected as the first prime contractor under the current phases of Homeland Security’s federal government-wide Continuous Diagnostics and Mitigation (CDM) program, which was launched in 2012 to better monitor and guard .gov networks from cyberattacks.

Homeland Security has already contracted with Booz Allen and a few other firms in the early stages of CDM to begin implementing the program across 13 federal agencies and departments.

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The new contract extends across the next three phases of CDM and is part of a larger program called the Dynamic and Evolving Federal Enterprise Network Defense, valued at as much as $3.4 billion.

Marcie Nagel, who leads Booz Allen’s CDM work, said in a statement that the firm is “thrilled to grow our partnership with Department of Homeland Security in their critical mission to protect the United States and its citizens from cybersecurity threats.”

“Our work will expand into new areas of cybersecurity, like incident response and automation,” Nagel said. “This work aims to help these federal departments and agencies leverage new capabilities that will ultimately empower our clients to defend their networks faster with more flexibility and greater visibility into the network itself.”

Homeland Security is responsible for protecting federal networks from cyber threats, in addition to engaging with operators of critical infrastructure to guard U.S. critical services from cyber and physical attacks.