District of Columbia (DC) Federal Apparatus
From The RadioReference Wiki
Federal Bureau of Investigation Police (provides physical security for FBI facilities in Washington DC area)
U.S. Capitol Police
Federal Protective Service Police
U.S. Customs & Border Patrol
U.S. Customs & Border Patrol Helicopter
U.S. Customs & Border Patrol Newer Helicopter
U.S. Fish & Wildlife Service Police
U.S. Mint Police
U.S. Secret Service Uniformed Division Police
U.S. Park Police
U.S. Park Police Eagle 1 Helicopter
Naval District Washington Police
Presidential Helicopter HMX-1 Marine 1
President's Limo "The Beast"