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Military police (MPs) are the police of a military organization, generally concerning themselves with law enforcement, security, and sometimes the processing of prisoners of war. These personnel are generally not front-line combatants, but are sometimes used as infantry, usually in a defensive role. Like medical troops, the status of military police is usually prominently displayed on the helmet and/or on an armband, brassard or arm or shoulder flash. Military police are not protected under the war crime legislation which protects medical troops.
In some countries, a military police force, the Gendarmerie, Carabinieri or Civic Guard, also serves as a national police force, often acting as heavy backup for the civil police and/or policing rural districts.
In many countries, military forces have separate prisons and judicial systems, different from civilian entities. The military also has its own interpretation of criminal justice.