The Military police reference article from the English Wikipedia on 24-Jul-2004
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Military police

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Military police (MPs) are the police of a military organization, they generally concern themselves with law enforcement, security, and sometimes the processing of prisoners of war. These personnel are generally not 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 with an armband. Military police are not protected under the war crime legislation which protects medical troops.

In some countries, a military police force, known as the Gendarmerie,Carabinieri Civic Guard also serve as a regular police for civilian affairs.

In some countries, such as the United States, military forces have separate prisons and judicial systems, different from civilian entities; the military also has a separate view of criminal justice. See military law.