text: United States The Military Police Corps maintains discipline and enforces the law in the United States Army. The Marine Corps has the United States Marine Corps Military Police, while personnel assigned to the Master-at-Arms branch fill the same role in the United States Navy (aided by temporary members of the Shore patrol). The United States Air Force and the United States Space Force are policed by the United States Air Force Security Forces, formerly called the Air Police and then the Security Police.
  Each service also maintains uniformed civilian police departments. They are referred to as Department of Defense Police (DoD Police). These police fall under each directorate they work for within the United States Department of Defense, for example: DoD Army or DoD Navy Police. The Department of the Air Force Police operate under the air provost marshal. The police officers' duties are similar to those of local civilian police officers. They enforce the Uniform Code of Military Justice (UCMJ) and federal laws, along with state laws if the state legislature of whatever state that federal peace officer is in gives them the authority to enforce state law or classifies them as a peace officer under state law, and the regulations of their particular installation.
  Felony-level criminal investigations in the United States Armed Forces are carried out by separate agencies:
  Army Criminal Investigation Division (CiD)—Army (general felony crimes)
  Army Counterintelligence (CI)—Army (national security crimes)
  Marine Corps Criminal Investigation Division (CID)—Marine Corps
  Naval Criminal Investigative Service (NCIS)—Navy and Marine Corps