Department of Defense Directive 5105.68: Pentagon Force Protection Agency (PFPA), December 19, 2008 [open pdf - 103KB]
"This Directive applies to OSD, the Military Departments, the Office of the Chairman of the Joint Chiefs of Staff and the Joint Staff, the Combatant Commands, the Office of the Inspector General of the Department of Defense, the Defense Agencies, the DoD Field Activities, and all other organizational entities within the Department of Defense (hereafter referred to collectively as the 'DoD Components'). [...] PFPA shall provide force protection, security, and law enforcement to safeguard personnel, facilities, infrastructure, and other resources for the Pentagon Reservation and for assigned DoD activities and DoD-occupied facilities within the National Capital Region (NCR) (hereafter referred to as the 'Pentagon Facilities'). This includes addressing the full spectrum of threats by utilizing a balanced strategy of comprehensive protective intelligence analysis, prevention, preparedness, detection, all-hazards response, DoD crisis management, and support to the lead emergency management agency. PFPA will be the DoD focal point for collaboration and coordination with other DoD Components, other Executive Departments and Agencies, and State and local authorities on matters involving force protection, security, and law enforcement activities that impact the Pentagon Facilities. PFPA will also provide comprehensive threat assessments, security, and protection services for OSD personnel and other DoD persons, as assigned."
DoD Directive 5105.68; DoDD 5105.68
Defense Technical Information Center (DTIC): http://www.dtic.mil/dtic/