Military Provost Guard Service

The primary role of the MPGS is to counter the terrorist threat posed to military bases in Great Britain through the provision of armed guarding services.

MPGS duties include:

• Controlling entry and exit to a site.
• Managing control room operations and ensuring all visitors are dealt with efficiently.
• Patrolling site perimeters and taking necessary action to preserve perimeter security.
• Security incident management, such as suspicious packages, bomb threats, protests, etc.
• Military Working Dog services at some sites.

The MPGS is part of the Provost Branch of the Adjutant General's Corps and is under the direction of Provost Marshal (Army), who is the Director and Head of Service. MPGS units are formed under the command of their respective Head of Establishment, with Provost Marshal (Army) maintaining technical standards through annual inspections.
http://www.army.mod.uk/agc/provost/31527.aspx