The Booz Allen Hamilton Holding Corp office building is seen in McLean, Virginia, U.S. June 11, 2013. REUTERS/Kevin Lamarque/File Photo Booz Allen scores $621M DHS contract for government-wide cybersecurity program The award is tied to the Dynamic and Evolving Federal Enterprise Network Defense (DEFEND) Program, part of CDM Phase 3. Feb 2, 2018 By Chris Bing