Abbreviations Used in Military Documents and for Medal Inscriptions - Abbreviations: O
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O |
|
| O | Operations Branch of the General Staff, Observer, Officer |
| O & R RLWY VOL RIF | Oudh & Rohilkund Railway Volunteer Rifles |
| O BDR | Lance Bombardier |
| O DEPT EA | Ordnance Department Egyptian Army |
| O KPL | Lance Corporal |
| O TEL | Ordinary Telegraphist |
| O, OFFR(S) | Officer(s) |
| O/ | Ordinary |
| O/C, OC | Officer Commanding |
| O/Cdt | Officer Cadet |
| O/S | Ordinary Seaman, Overseas |
| O/S, OS | Overseas |
| O/SBCDC | Intermediate Overseas Base, Canadian Dental Corps OR Canadian Disciplinary Centre |
| O/SDCCODRCOC | Overseas Detachment Canadian Camp Ordnance Depot, Royal Canadian Ordnance Corps |
| O/SERS | Lance Sergeant |
| OA,1c(or 2c,3c,4c,5c) | Ordnance Artificer, 1st Class (or 2nd,3rd,4th or 5th Class) |
| OAC | Ontario Agricultural College, Ordnance Ammunition Company, Ottawa Area Command |
| OACRCOC | Ordnance Ammunition Company, Royal Canadian Ordnance Corps |
| OACRO | Ottawa Area Command Routine Orders |
| OAMCU | Overseas Air Movements Control Unit |
| OAP | Observation Amphibian Plane (US) |
| OARCE | Officer Administering, Royal Canadian Engineers |
| OAS | On Active Service, Organization of American States |
| OB | Operational Base |
| OBE | Officer of the Order of the British Empire |
| OBIT | Died |
| OBLI, O & BLI | Oxfordshire & Buckinghamshire Light Infantry |
| OBS | Obsolete |
| OBU | Operational Base Unit |
| OBV | Ocean Boarding Vessel |
| OC | Officer Commanding, Officer Cadet, Officer of the Order of Canada, Officer's Clerk |
| OC MED | Officer Commanding Medical |
| OC SURG | Officer Commanding Surgeon |
| OCDP | Officer Career Development Plan |
| OCdr | Ordinary Coder |
| OComm | Orders Committee |
| OCRCRCAMC | Oakville Casualty Retraining Centre, Royal Canadian army Medical Corps |
| OCRN | Officer Commanding, Royal Navy |
| OCS | Officer Candidate School, Officers' Chief Steward |
| OCT | Officer Cadet in Training |
| OCTP | Officer Cadet (or Candidate) Training Plan |
| OCTU | Officer Cadet Training Unit |
| OCU | Operational Conversion Unit |
| OCW | Officer-in-Charge Works |
| OD | Air Mechanic (Ordnance) |
| ODC | Ordnance Depot Company |
| ODSRCOC | Ordnance Depot Saskatoon, Royal Canadian Ordnance Corps |
| ODT | Office of Defence Transportation |
| OEO | Ordnance Engineer Office |
| Off | Office |
| OFF CK | Officers Cook |
| OFF ST , OS | Officers Steward |
| OffcCdt | Officer Cadet |
| OFFICE SUPDT | Office Superintendent |
| Offr, O | Officer |
| OG | Operational Group |
| OGp | Orders Group |
| OGS | Officer General Specification |
| OHA | Osmali Horse Artillery, Osmanli Horse Artillery |
| OHF | Occupational History Form |
| OHMS | On His (Her) Majesty's Service |
| OHQ | Overseas Headquarters |
| Oi/c, OIC | Officer of Charge or Command) |
| OIC | Osmali Irregular Cavalry, Osmanli Irregular Cavalry |
| OILER & GR | Oiler & Greaser |
| OINC | Officer-in-Charge, Order in Council |
| OItoCSGHQEA | (Ordnance) Increment to Canadian Section General Headquarters Echelon Army Group |
| OKH | Oberkommando des Heeres (Army High Command, Berlin) |
| OKW | Oberkommando der Wehrmacht (Armed Forces High Command) |
| OM | Order of Merit, Overseas Minister |
| OMD | Ordnance Medical Department |
| OMERU | Ordnance Mechanical Engineers Reinforcement Unit |
| OMFC | Overseas Military Forces of Canada |
| OMHRCAMC | Orillia (or Ottawa, Ozada) Military Hospital, Royal Canadian Army Medical Corps |
| OMM | Officer of the Order of Military Merit |
| OMO | Ordnance Mechanical Officer |
| ON | United Kingdom-North America Convoy, Official Number |
| ONBASHI | Corporal |
| ONS | United Kingdom-North America Slow Convoy |
| Ont | Ontario |
| ONT MILY HOSP | Ontario Military Hospital |
| ONT RGT, ONTR, OR | Ontario Regiment |
| ONUC | Organisation des Nations Unies au Congo |
| OO | Ordnance Officer, Orderly Officer, Operation(al) Order |
| OOD, OD | Officer of the Day |
| OofPCTintheFAAI | Office of the Paymaster Canadian Troops in the Field Allied Armies in Italy |
| OoftheI-G | Office of the Inspector-General |
| OoftheJAG | Office of the Judge Advocate General |
| OOG | Officer of the Guard |
| OOKEIP VOLS | Ookeip Volunteers |
| OOP | Officer of Patrol |
| OOPE | Officer in charge Office Practice & Equipment (Naval) |
| OOTW | Operations Other Than War |
| OOW | Officer of the Watch |
| OP | Observation post, opposite prompt, Operation, Operating |
| OPA | Oxford Patriotic Association |
| OPD | Other Protestant Denomination |
| OPDP | Officer Professional Development Program |
| OpEEqpt | Operator Engineering Equipment |
| OPI | Office of Primary Interest |
| OPME | Officer Professional Military Education |
| OpMME | Operator Mechanic Mobile Equipment |
| OPO, OO | Operation(al) Order |
| OpRmA | Operating Room Assistant |
| Oprs | Director of Military Operations & Intelligence |
| ops, op | operations |
| OpSbd | Operator Switchboard |
| OpsO | Operations Officer |
| OpSSE | Operator (Special Engineering Equipment) |
| OPtlmn | Ordinary Patrolman |
| OPTR | Operator |
| OPV | Offshore Patrol Vessel |
| OQ | Occupation Qualification |
| OR | Ontario Regiment, Other Rank(s), Oxford Rifles, Operating Room Assistant, Orderly, Orderly Room |
| OR SCTS | Orange River Scouts |
| OR(S) | Orderly Rooms, Other Ranks |
| ORBAT, OOB | Order of Battle |
| ORBS | Overseas Recorded Broadcasting Service |
| ORC PROV MP | Orange River Colony Provisional Mounted Police |
| ORC VOLS | Orange River Colony Volunteers |
| ORD | Ordinary Seaman, Ordnance |
| ORD CLK | Orderly Clerk |
| ORDNANCE DEPT | Ordnance Department |
| Org | Director of Organization |
| ORGN | Organization |
| ORP | Polish Ship |
| ORPEN'S LH | Orpen's Light Horse |
| ORS | Ottawa Routing Summary |
| ORS, OR SGT, OR SJT, ORSE | Orderly Room Sergeant |
| OS | Officers School |
| OS | Overseas, Ordinary Seaman, Officer's Steward, Observation Section (Records) |
| OSAB | Officer's Selection Appraisal Board (O-1 Officers' Training Centre) |
| OSAC | Officer Selection Appraisal Centre |
| OSAIRCOC | Ordnance Stores Accounting Inspectorate, Royal Canadian Ordnance Corps |
| OSC | Ordnance Staff Corps, Ordnance Store Company |
| OSCRCOC | Ordnance Store Company, Royal Canadian Ordnance Corps |
| OSDEF | Orkneys & Shetland Defences |
| OSig | Ordinary Signalman |
| OSMSCMHQRCOC | Ordnance Services Mobilization Staff, Canadian Military Headquarters, Royal Canadian Ordnance Corps |
| OSQ | Occupation Specialty Qualification |
| OSRD | Office of Scientific Research and Development |
| OSS | Office of Strategic Services |
| OSSDRCOC | Officers Shop Supply Depot, Royal Canadian Ordnance Corps |
| OT | Occupation Transfer, Aruba-Dakar Convoy |
| OTC | Officers Training Centre (or Corps, Candidate) |
| OTC"R" | Officers Training Centre "Reserve" |
| OTel | Ordinary Telegraphist |
| OTRM RFLS | Outrams Rifles |
| OTS | Officers Training School, Operational Training Squadron |
| OTU | Operational Training Unit(s) |
| OU | Official Use |
| OUDTSHOORN VR | Oudtshoorn Volunteer Rifles |
| OUT | Operational Training Unit |
| OUTRN RFLS | Outranis Rifles |
| OVERSEER | Overseer |
| OW/SCoyRCOC | Ottawa Workshop Company, Royal Canadian Ordnance Corps |
| OW/SRCEME | Ottawa Workshop, Royal Canadian Electrical and Mechanical Engineers |
| OW/SRCOC | Ordnance Workshop, Royal Canadian Ordnance Corps |
| OX DVR | Ox Driver |
| OX TPT DEPOT | Ox Transport Depot |
| OXF & BUCKS LI, OX&BUCKSLI | Oxfordshire & Buckinghamshire Light Infantry |
| OXF YEO, OY | Oxfordshire Yeomanry |
| OXV | Outer Examination Vessel |