Portugal
In Portugal, each branch of the armed forces has its own military police force. The Portuguese Navy has the Polícia Naval (Naval Police), the Portuguese Army has the Polícia do Exército (Army Police), and the Portuguese Air Force has the Polícia Aérea (Air Police). The Air Police is an Arm of its own inside the Air Force, but the Army Police is only a speciality of the Cavalry Arm and the Naval Police is a speciality of the Fuzileiros (Marines) Corps. The Navy also has a coast guard police force, composed by Portuguese Navy troops, the Polícia Maritima (Maritime Police), with the responsibility of guarding the Lisbon Naval Base and some other naval facilities, and to serve as a coast guard and criminal police in the area of responsibility of the Maritime Authority.
Portugal, also, has a gendarmerie type force, the GNR - Guarda Nacional Republicana (National Republican Guard), a special corps of troops that executes both civil public security missions and military missions. In time of peace, the GNR is under operacional command of the Minister of Internal Affairs, but in time of war it can be put under the command of the Armed Forces.
Read more about this topic: Military Police