The Pentagon Force Protection Agency (PFPA) protects and keeps safe the occupants, visitors, and infrastructure of the Pentagon, Navy Annex and other assigned Pentagon facilities. PFPA is a civilian Defense Agency within the United States Department of Defense. PFPA does its job using law enforcement officers (Pentagon Police), criminal investigative and protective services agents; threat management agents; chemical, biological, radiological, nuclear and explosives technicians; and anti-terrorism/force protection and physical security personnel.