OADF: Overseas Aircraft Delivery Flight
OADU: Overseas Aircraft Delivery Unit
OANS: Observers Air Navigation School
OAP: Offset Aim Point
OAPU: Overseas Aircraft Preparation Unit
OAR: Obusna Aeroplansva Radionica
OAS: Offensive Avionics System
OATS: Officers Advanced Training School
obs: observation
OBS: Observer School
OC: Officer Commanding
OC: Optimum Cruise
OCONUS: Outside of the Continental United States
OCTU: Officer Cadet Training Unit
OCU: Operational Conversion Unit
OEH: Occupational & Environmental Health
OEH-MIS: Occupational & Environmental Health-Management Information System
OEHED: Occupational & Environmental Health Exposure Data
OEHME: Occupational & Environmental Health Medical Examination
OEHSA: Occupational & Environmental Health Site Assessment
OEHWG: Occupational & Environmental Health Working Group
OEM: Original Equipment Manufacturer
OEU: Operational Evaluation Unit
OFU: Overseas Ferry Unit
OG/CC: Operations Group Commander
OH: Occupational Health
OIC: Officer's Initial Course officers
OO: Orderly Officer
OP: Observation Post
op: operation
op: operator
OPL: operational
OPORD: Operations Order
OPR: Office of Primary Responsibility
ORB: Operations Record Book
ORM: Operational Risk Management
ORS: Offensive Radar Set
ORS: Operational Research Section
ORTU: Operational & Refresher Training Unit
OS: Observers School