The Defense Intelligence Analysis Center is the largest operating facility of the Defense Intelligence Agency (DIA). While the Pentagon is the agency’s official headquarters, the Defense Intelligence Analysis Center at Bolling Air Force Base in Washington, D.C. is where the majority of DIA’s employees are located. The National Defense Intelligence College and the Defense Intelligence Operations Coordination Center. In 2005 DIA opened the DIAC Expansion which allowed for more DIA personnel to serve under one roof than ever before.