Oakland Army Base (OARB)Oak Leaf Cluster (OLC)
objective (obj)
objective force gross requirement (OFGR)
obligate (oblg)
obligated war reserves (OWR)
obligation authority (OBLAUTH)
observation (obsn)
observation post (OP)
observed fire trainer (OFT)
observer target (OT)
observer training (OBT)
obsolete (ob)
obstacle (obs)
occupational medicine (OCCMED)
Occupational Safety and Health Action (OSHA)
occupational therapy-therapist (OT)
Office (*O)
office (ofc)
Office for the Civilian Health and Medical Program of the Uniformed Services (OCHAMPUS)
Office, Management Information Systems (OMIS)
office motor vehicle transportation officer (OMVTO)
Office of Civilian Personnel (OCP)
Office of Defense Representative, Pakistan (ODRP)
Office of Director of Defense Research and Engineering (ODDRE)
Office of Emergency Planning (OEP)
Office of Emergency Transportation (OET)
Office of Federal Employees' Compensation (OFEC)
Office of Industrial Personnel Access Authorization Review (OIPAAR)
Office of Information for the Armed Forces (IAF)
Office of Management and Budget (OMB)
Office of Naval Intelligence (ONI)
Office of Naval Research (ONR)
Office of Personnel Management (OPM)
Office of Procurement and Materiel (OPM)
Office of Strategic Information (OSI)
Office of the Chief, Army Reserve (OCAR)
Office of the Chief of Chaplains (OCC)
Office of the Chief of Engineers (OCE)
Office of the Chief of Legislative Liaison (OCLL)
Office of the Chief of Military History (OCMH)
Office of the Chief of Public Affairs (OCPA)
Office of the Deputy Chief of Staff for Research, Development, and Acquisition (ODCSRDA)
Office of the Chief of Staff, U.S. Army (OCSA)
Office of the Comptroller of the Army (OCA)
Office of the Deputy Chief of Staff for Logistics (ODCSLOG)
Office of the Deputy Chief of Staff for Operations and Plans (ODCSOPS)
Office of the Deputy Chief of Staff for Personnel (ODCSPER)
Office of the Directorate of Weapon Systems Analysis (ODWSA)
Office of the Inspector General (OTIG)
Office of the Judge Advocate General (OTJAG)
Office of the Provost Marshal General (OTPMG)
Office of the Secretary of Defense Identification Badge (OSDIDBAD)
Office of the Secretary of Defense (OSD)
Office of the Secretary of the Army (OSA)
Office of The Surgeon General (OTSG)
Office of the United States Army Attache (OUSARMA)
Office of the United States Defense Representatives, India (ODRI)
Office, Ogden Air Material Area (OOAMA)
officer (off)
officer candidate (OC)
Officer Candidate School (OCS)
Officer Candidate Test (OCT)
officer conducting the exercise (OCE)
officer evaluation report (OER)
officer evaluation reporting system (OERS)
officer in charge (of) (OIC)
officer in charge of construction (OICC)
officer master file (OMF)
officer of the day (OD)
officer of the guard (OG)
officer distribution plan (OPD)
Officer Personnel Directorate, MILPERCEN (OPD)
Officer Personnel Management System (OPMS)
Officer Record Brief (ORB)
officer's open mess (OOM)
officer's qualification record (OQR)
Officer Undergraduate Degree Program (OUDP)
Office, Services and Information Agency (OSIA)
official military personnel file (OMPF)
official personnel folder (OPF)
offshore acquisition (OSA)
offshore procurement (OSP)
on-condition maintenance (OCM)
on equipment materiel (OEM)
one station unit training (OSUT)
on or about (OA)
on order (oo)
on-the-job training (OJT)
operate (op)
operated (op)
operating information systems (OIS)
operating level (OL)
operating location (OL)
operating strength (OPSTR)
operation (op)
operational (op)
operational acceptance test (OAT)
operational availability data (OAD)
operational capability objective (OCO)
operational capability plan (OCP)
operational command (OPCOM)
operational command and control intelligence system (OCCIS)
operational command and control system (OCCS)
operational control (OPCON)
operational control authority (OCA)
operational control console (OCC)
operational employment concept (OEC)
operational employment plan (OEP)
operationally ready (OPRDY)
operational navigation chart (ONC)
operational project (OP)
operational project requirements (OPR)
operational readiness (OR)
operational readiness evaluation (ORE)
operational readiness float (ORF)
operational readiness inspection (ORI)
operational readiness inspection test (ORIT)
operational readiness training (ORT)
operational readiness training program (ORTP)
Operational Readiness Training Test (ORTT)
operational reporting (OPREP)
Operational Reports-Lessons Learned (ORLL)
operational storage site (OSS)
operational support airlift (OSA)
operational test (OT)
operational test and evaluation (OTE)
Operational Test and Evaluation Agency (OTEA)
operational training unit (OTU)
operation and maintenance (O&M)
Operation and Maintenance, Army (OMA)
Operation and Maintenance, Army National Guard (OMARNG)
Operation and Maintenance, Army Reserve (OMAR)
operation and maintenance, family housing (O&MFH)
operation and maintenance of facilities (OMF)
operation and maintenance of facilities budget activity account (OMFBAA)
operation and maintenance of facilities cost account (OMFCA)
operation and maintenance of facilities summary cost account (OMFSCA)
operation order (OPORD)
operation plan (OPLAN)
operations and training officers (U.S. Army) (S3)
operations central (OC)
operations code (OPCODE)
Operations Coordinating Board (OCB)
Operations Directorate (J3)
operations research analyst (ORA)
Operations Research/Systems Analysis (ORSA)
operations security (OPSEC)
operator (op)
ophthalmology (ophth)
opposing forces (OPFOR)
optical character reader (OCR)
optical character recognition equipment (OCRE)
optical discrimination and tracking system (ODTS)
optical landing system (OLS)
optical mark page reader (OMPR)
optional form (OF)
ordered to active duty (OAD)
order of battle (OB)
Order of Merit List (OML)
order ship time (OST)
orderwire (OW)
ordnance (ord)
Ordnance Corps (OD)
ordnance telemetry instrumentation station (OTIS)
organization (org)
organizational effectiveness (OE)
organizational equipment list (OEL)
organizational expense accounts (OEA)
organizational maintenance shop (OMS)
organizational maintenance technician (OMT)
organizational maintenance test station (OMTS)
organizational spare parts and equipment (OSPE)
organizational supply code (OSC)
organization and equipment guide (OEG)
organization and methods (O&M)
Organization of American States (OAS)
organize (org)
organized (org)
other intelligence requirements (OIR)
other pay entry date (OPED)
Other Procurement, Army (OPA)
other than honorable conditions (OTH)
other than Regular Army (OTRA)
Other War Reserve Material Stocks (OWRMS)
outlying field (OLF)
outside continental United States (OCONUS)
oversea replacement (OSREPL)
oversea returnee (OSRET)
Overseas Internal Defense Policy (OIDP)
overseas internal security program (OISP)
overseas limited storage site (OLSS)
overseas operational storage site (OOSS)
overseas records center (ORCEN)
Overseas Service Ribbon (OSR)
oversea terminal arrival date (OTAD)
overseas unit replacement system (OVUREP)
over, short, and damaged report (OSD)
overtime (OT)
ownership purpose code (O/P)