text: Air Force Office of Special Investigations (OSI)—Air Force
  Coast Guard Investigative Service (CGIS)—Coast Guard
  The Defense Criminal Investigative Service (DCIS) is a civilian agency that answers directly to the DOD as well as the Pentagon Force Protection Agency (PFPA).
  The United States Constabulary was a gendarmerie force used to secure and patrol the American Zone of West Germany immediately after World War II.
  Combat roles of military police
  Military police in the U.S. Army, Navy, Air Force and Marine Corps, in addition to their roles as enforcers of law and order on military installations, fulfill a number of combat roles as well. Military police in Afghanistan and Iraq have been widely employed for such duties as convoy security, mounted and dismounted patrols, maritime expeditionary warfare, military working dog operations, security details for senior officers, and detainee handling. Army MPs, Navy MAs, Navy sailors who possess the Navy Enlisted Classification (NEC) Code 2008 and 9575, sailors who have completed the individual augmentee (IA) training for detention operations, and Air Force Security Forces have been widely used as prison guards in detainee facilities, whereas Marine Corps MPs focus on securing and processing detainees before passing them on to Army holding facilities.
  Limitation of authority and jurisdiction