United States Department of Defense United States Department of Defense The Department of Defense (DoD, USDOD, or DOD) is an executive branch department of the federal government charged with coordinating and supervising all agencies and functions of the government concerned directly with national security and the United States Armed Forces. The department is the largest employer in the world, with nearly 1.3 million active duty servicemen and women as of 2016. Adding to its employees are over 826,000 National Guardsmen and Reservists from the four services, and over 742,000 civilians bringing the total to over 2.8 million employees. Headquartered at the Pentagon in Arlington, Virginia,
Department of the Army Civilian Police "Department of Defense Police" is a catch-all phrase that refers to any civilian engaged in police duties for the Department of Defense and its component branches of the US Armed Forces. There is no such unified agency that goes under the title "Department of Defense Police". A Fort Irwin Department of the Army Civilian Police Officer is assigned the federal occupational series code "0083", the code reserved for police and federal protective officers in the U.S. Government civil service. This occupational series code applies regardless of what specific agency of the officer works for. Individual installations conduct the hiring process