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.