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