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(O)
Denotes an Officer who has qualified and has been confirmed as Naval Observer. In a ship, an Officer confirmed and borne for Observer Duties. (Source: Australian Navy List, 1941)
(O)           
Observer Officer (RAF)
O
Officer
O Lt Cr
Ordnance Lieutenant Commander
O Tng Bde
Overseas Training Brigade [First World War AIF Infantry Unit]
O-1
Bird dog, United States Army/United States Air Force observation, single engine aircraft (Vietnam War)
OA
Ordnance Artificer
OA
Objective Area
OAEWO
Operational Area Emergency Works Officer
OAT
Outside Air Temperature
OBD
Ordnance Base Depot
OBD
Ordnance Beach Detachment
OBE
Officer of the Order of the British Empire. Officers and Warrant Officer's for valued service in Peace or War
OBJ
Object
obs
Observation
obs
Obstacle
Obsn
Observation (USA)
Obsr
Observer (USA)
OBU
Operational Base Unit (RAAF)
OC
Officer Commanding (First World War)
OCA
Operational Control Authority
OCCABA
Open Circuit Compressed Air Breathing Aparatus
OCE
Officer Conducting Exercises (RAN)
OCLF
Officer Commanding Land Force (Signal Unit)
OCNGA
Officer in Charge of National Guard Affairs (USA)
OCO
Office of Civil Operations (Vietnam War)
OCR
Other Christian Religions
OCS
Officer Cadet School
OCT
Ordnance, Commissariat and Transport
OCTU
Officer Cadets' Training Unit
OCU
Operational conversion unit(s)
OD
Officer of the Day
OD
Ordinary Seaman
Odly
Orderly (USA)
OECD
Organisation for Economic Cooperation and Development
OEE
Open Ended Enlistment (ARA Other Ranks)
OETA
Occupied Enemy Territory Administration
OEW
Office of Economic Warfare, Washington
off
Official
Offr
Officer
Oflag
Offizierlager (German) - Prisoner of war camp for officers
OFM
Ordnance Field Manual (USA)
OFOF
Orders for Opening fire
OFP
Ordnance Field Park (Vietnam War)
OFS
Orange Free State
OFSB
Ordnance Field Service Bulletin (USA)
OG
Officer of the Guard (USA)
OG (RAAF)
Operational Group
OGPU
Osobennoye Gosudarstvennoye Politicheskoye Upravlenie (Special State Political Department, USSR)
OH-13
Sioux – United States observation helicopter (Vietnam War)
OH-23
Raven – United States observation helicopter (Vietnam War)
OHD
Over the Horizon Radar
OHMS
On His/Her Majesty's Service
OHS
Occupational Health and Safety
OI
Operation Instructions
OIC
Officer in Charge
OIN
Operations and Intelligence
OJT
On the job training
OL
Online Aircraft Establishment
OLAC
Operational level of capability
Oleo
Undercarriage leg (RAAF)
OLLA
Office of Lend Lease Administration (Washington)
OM
Member of the Order of Merit
OM
Organisation and Methods
OMC
Owen Machine Carbine (Owen submachine gun)
OME
Ordnance Mechanical Engineer
OMF
Originating Medical Facility
OMGUS
Office of Military Government for Germany (USA)
ONC
Other Non Christians
ONI
Office of Naval Intelligence (USA)
ONTOS
Self propelled direct fire, anti tank weapon (Vietnam War)
ONUC
United Nations Force in the Congo (Peacekeeping)
ONUCA
United Nations Observer Group in Central America (Peacekeeping)
OO
Operation Order
OO
Ordnance Officer
OO
Orderly Officer
OOA
Out of Area
OOB
Order of Battle
OOV
Objects of Veneration
OOW
Officer of the Watch
OP
Observation Post
Op
Operating
Op Gp HQ
Operation Group, Headquarters (RAAF)
op/s
Operational/operations
OPCON
Operational Control
OPD
Operational Planning Division, War Department General Staff (USA)
OPER
Operational Airfield (RAAF)
OPL
Outpost Line (USA)
OPLAN
Operation Plan
OPORD
Operation Order
Ops
Operations
OPSEC
Operations Security (Vietnam)
OPSO
Operations Officer
OQMG
Office of the Quartermaster General (USA)
OR
Other ranks (gunner, private, driver or sapper)
ORBAT
Order of Battle
ORC
Officer's Reserve Corps (USA)
ORD
Ordnance
ORE
Operational Readiness Evaluation (RAN)
ORG
Operational Research Group
org
Organised/organisation
ORO
Operations Research Officer (USA)
ORP
Operational Readiness Platform
ORTH
Greek Orthodox
OS
Officer Steward
OS
Orderly Sergeant
OS
Offensive Support (RAN)
OSC
On Scene Commander
OSE
Officer Scheduling Exercises (RAN)
OSGAP
Office of Secretary General in Afghanistan and Pakistan
OSS
Office of Strategic Services (USA)
OSU
Operational Support Unit, RAAF (Vietnam War)
OSW
Office of Secretary of War (USA)
Otago MR Regt
Otago Mounted Rifles Regiment [First World War New Zearland Unit]
OTB
Overseas Training Brigade (First World War)
OTC
Officers' Training Corps
OTC
Officer in Tactical Command
OTCI
Overseas Telecommunications Corporation International
OTH
Over the horizon
OTHR
Over the horizon radar
OTHT
Over the horizon targeting
OTS
Officer's Training School
OTT
One Time Tape
OTU
Operational Training Unit (RAAF)
OUSW
Office Under Secretary of War (USA)
OV-1
Mohawk - United States observation aircraft (Vietnam War)
OVERWATCH
A ‘be prepared’ mission that implies the monitoring of another unit’s activities. (Vietnam War)
OW
Order Wire
OWI
Office of War Information (USA)
Oxf Bucks
The Oxfordshire and Buckinghamshire Light Infantry
OXY
Oxygen

This Glossary is intended as a research tool that makes the Memorial’s records more accessible. As such, it contains terms that have been encountered in the Memorial’s collection of primary records as well as in secondary sources.  Users should note, therefore, that some of the terms may not reflect accepted usage; some may even appear to be incorrect.