offensive power

offensive reconnaissance

offensive surveillance

offensive weapon(s)

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 under secretary of defense for acquisition and technology

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

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

Officer Assembly


officer candidate school

officer commanding (ОС)

officer commissioned from the ranks

officer conducting the exercise (OCE)

officer corps

officer enlistment

officer in charge

officer in charge of logistics

officer in command

officer leadership training course

officer of primary responsibility

officer of the day

officer of the deck

officer of the guard

officer of the line

officer of the watch

officer (offr)

officer Personnel Directorate

officer promotion system

officer rank

officer scheduling the exercise

officer student

officers and men

officers' mess

officer's orderly

officers’ staterooms

official document

official record

official Secrets Act