Glossary
In our collection you will encounter military terminology and acronyms. Here you can find out what they mean.
Officer
Ordnance Lieutenant Commander
Overseas Training Brigade [First World War AIF Infantry Unit]
Bird dog, United States Army/United States Air Force observation, single engine aircraft (Vietnam War)
Ordnance Artificer
Objective Area
Operational Area Emergency Works Officer
Outside Air Temperature
Ordnance Base Depot
Ordnance Beach Detachment
Officer of the Order of the British Empire. Officers and Warrant Officer's for valued service in Peace or War
Object
Observation
Obstacle
Observation (USA)
Observer (USA)
Operational Base Unit (RAAF)
Officer Commanding (First World War)
Operational Control Authority
Open Circuit Compressed Air Breathing Aparatus
Officer Conducting Exercises (RAN)
Officer Commanding Land Force (Signal Unit)
Officer in Charge of National Guard Affairs (USA)
Office of Civil Operations (Vietnam War)
Other Christian Religions
Officer Cadet School
Ordnance, Commissariat and Transport
Officer Cadets' Training Unit
Operational conversion unit(s)
Officer of the Day
Ordinary Seaman
Orderly (USA)
Organisation for Economic Cooperation and Development
Open Ended Enlistment (ARA Other Ranks)
Occupied Enemy Territory Administration
Office of Economic Warfare, Washington
Official
Officer
Offizierlager (German) - Prisoner of war camp for officers
Ordnance Field Manual (USA)
Orders for Opening fire
Ordnance Field Park (Vietnam War)
Orange Free State
Ordnance Field Service Bulletin (USA)
Officer of the Guard (USA)
Operational Group
Osobennoye Gosudarstvennoye Politicheskoye Upravlenie (Special State Political Department, USSR)
Over the Horizon Radar
On His/Her Majesty's Service
Occupational Health and Safety
Operation Instructions
Officer in Charge
Operations and Intelligence
On the job training
Online Aircraft Establishment
Operational level of capability
Undercarriage leg (RAAF)
Office of Lend Lease Administration (Washington)
Member of the Order of Merit
Organisation and Methods
Owen Machine Carbine (Owen submachine gun)
Ordnance Mechanical Engineer
Originating Medical Facility
Office of Military Government for Germany (USA)
Other Non Christians
Office of Naval Intelligence (USA)
Self propelled direct fire, anti tank weapon (Vietnam War)
United Nations Force in the Congo (Peacekeeping)
United Nations Observer Group in Central America (Peacekeeping)
Operation Order
Ordnance Officer
Orderly Officer
Out of Area
Order of Battle
Objects of Veneration
Officer of the Watch
Observation Post
Operating
Operation Group, Headquarters (RAAF)
Operational/operations
Operational Control
Operational Planning Division, War Department General Staff (USA)
Operational Airfield (RAAF)
Outpost Line (USA)
Operation Plan
Operation Order
Operations
Operations Security (Vietnam)
Operations Officer
Office of the Quartermaster General (USA)
Other ranks (gunner, private, driver or sapper)
Order of Battle
Officer's Reserve Corps (USA)
Ordnance
Operational Readiness Evaluation (RAN)
Operational Research Group
Organised/organisation
Operations Research Officer (USA)
Operational Readiness Platform
Greek Orthodox
Officer Steward
Orderly Sergeant
Offensive Support (RAN)
On Scene Commander
Officer Scheduling Exercises (RAN)
Office of Secretary General in Afghanistan and Pakistan
Office of Strategic Services (USA)
Operational Support Unit, RAAF (Vietnam War)
Office of Secretary of War (USA)
Otago Mounted Rifles Regiment [First World War New Zearland Unit]
Overseas Training Brigade (First World War)
Officers' Training Corps
Officer in Tactical Command
Overseas Telecommunications Corporation International
Over the horizon
Over the horizon radar
Over the horizon targeting
Officer's Training School
One Time Tape
Operational Training Unit (RAAF)
Office Under Secretary of War (USA)
Mohawk - United States observation aircraft (Vietnam War)
Order Wire
Office of War Information (USA)
The Oxfordshire and Buckinghamshire Light Infantry
Oxygen