administrative district office

administrative company / administrative support company

district forces

Eastern Military District

military district

military district command

military district logistics

military district of Washington

Southern Military District

warning district

air district

army post office

CIA Office of Military Affairs (OMA)

commandant’s office

Defense Prisoner of War/Missing Personnel Office (DPMO)

Home Office

liaison office

National Reconnaissance Office (NRO)

NATO Office of Security (NOS)

office of civil and defense mobilization

Office of Homeland Security (OHS)

Office of NATO Standardization

Office of NATO Terminology Coordination

Office of Naval Intelligence (ONI)

office of naval research

Office of the Assistant Chief of Staff for Installation Management (OACSIM)

office of the chief of special warfare

Office of the Secretary of Defense (OSD)

Office of the Secretary of the Navy

Office of the Special Envoy of the Secretary-General for the future status process for Kosovo (UNOSEK)

Office of the Special Representative of the Secretary-General for West Africa (UNOWA)

Office of the United Nations Special Coordinator in the Occupied Territories (UNSCO)

Office of U.S. Foreign Disaster Assistance (OFDA)