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U.S. Military Abbreviations & Acronyms:  O

The military and government are famous for using - or overusing - abbreviations and acronyms for designating equipment, programs, and agencies. These eight pages are chock full of nearly every commonly used abbreviations and acronyms used by the U.S. military (at least up through around the year 2000).

A  B  C  D  E  F  G  H  I  J  K  L  M  N
O  P  Q  R  S  T  U  V  W  X  Y  Z
 

O/A
On or About
OA
(1) Office Automation; (2) Operations Analysis; (3) Operational
Area
OAC
Objective Architecture Center
OAD
(1) Operational Availability Date; (2) Objective Architecture Document
OAD-2
Objective Architecture Document, 2nd Iteration
OADR
Originating Agency’s Determination Required
OALAN
Office Automation Local Area Network
OAMP
Optical Airborne Measurements Program
OAP
(1) Organizational Assessment Package; (2) Offset Aim Point
OAPEC
Organization of Arab Petroleum-Exporting Countries
OAS
(1) Organization of American States; (2) Offensive Air Support
OASA(RDA)
Office of the Assistant Secretary of the Army (Research, Development, and Acquisition)
OASD
Office of the Assistant Secretary of Defense
OASD(C3I)
OASD (Command, Control, Communications, and Intelligence)
OASIS
(1) Operational Application of Special Intelligence Systems; (2) Office Automation System for Intelligence Support
OATS
(1) Operations Analysis for Tactical Support; (2) Online AIF Transaction System
OAU
Organization of African Unity
OB
Order of Battle
OBC
Optical Bar Camera
OBE
Overtaken By Events
OBI
Observable Human Resources Intelligence
OBI-OC
OBI Operations Center
OBIS
Order of Battle Intelligence System
Obj
Object
OBP
On-Board Processing
OBO
Official Business Only
OBS
(1) Ocean Baseline System; (2) Orders of Battle System; (3) Observations (Optical Tracking)
OBSS
(1) Off-Board Sensor Systems; (2) Operational Briefing Support System
OBSUM
Order of Battle Summary
OBU
OSIS Baseline Upgrade
OC
(1) Dissemination and extraction of Information Controlled; (2) Optical Carrier
O&C
Operations & Control
OCA
(1) Ocean Control Authority; (2) Operational Control Authority; (3) Offensive Counterair
OCAC
Operational Control and Analysis Center
OCAM
Afro-Malagasy and Mauritian Common Organization
OCAR
Office, Chief of Army Reserve
OCCIS
Operational Command and Control Information System
OCCULT
Optical Covert Communications Using Laser Transceivers
OCEANLANT
Ocean Atlantic Area (NATO)
OCJCS
Office of the Chairman, Joint Chiefs of Staff
OCM
Operational Coordination Message
OCMA
Objective Collection Management Architecture
OCMC
Overhead Collection Management Center
OCNO
Office of the Chief of Naval Operations
OCOKA
Observation and Fields of Fire, Concealment and Cover, Obstacles, Key terrain, Avenues of Approach, and Mobility Corridors
OCONUS
Outside CONUS
OCR
(1) Office of Collateral Responsibility; (2) Optical Character Reader
OCS
(1) Officer Candidate School; (2) Offensive Counterspace
OCS3
Optical Carrier 3 Communications
OCSA
Office of the Chief of Staff of the Army
OCSURV
Ocean Surveillance
OCU
Operational Conversion Unit
OD
Operating Directive(s)
ODA
Operational Detachment Alpha
ODC
Office of Defense Cooperation
ODCSINT
Office of the Deputy Chief of Staff, Intelligence
ODCSLOG
Office of Deputy Chief of Staff for Logistics
ODCSPER
Office of Deputy Chief of Staff for Personnel
ODECA
Organization of Central American States
ODIN
Operations Dedicated Imagery Network (LOCE)
ODISC4
Office of Director Information Systems Command, Control,
Communications,
Computers
ODJS
Office of the Director, Joint Staff
ODP
(1) Officer Distribution Plan; (2) Office of Defense Planning
ODRP
Office of the Defense Representative - Pakistan
ODS
(1) Open Data Server; (2) Operation DESERT STORM; (3) Output Data Server
OE
Operational Effectiveness
OECD
Organization for Economic Cooperation and Development
OEE
Operational ELINT Exploitation
OEF
Operational Exploitation Facility
OEG
Operational Exposure Guide
OEIC
Overseas Economic Intelligence Committee
OER
(1) Officer Evaluation Report; (2) Officer Efficiency Report; (3) Operational ELINT Requirements
OET
Office of Emergency Transportation
OFC
Office
OFCO
Offensive Counterintelligence Operation
Off
Officer
OFM
Office of Foreign Mission
OGOOI
Operations Group Operations Officer Intelligence (Air Force)
OGS
Overseas Ground Station
OGSI
Operations Group Support Intelligence (Air Force)
OHD
Over-the-Horizon Detection Radar
OHD-B
Over-the-Horizon Detection Radar-Backscatter
OI
(1) Operating Instruction; (2) Operational Interest
O&I
Operations & Intelligence
OIA
(1) Office of Imagery Analysis; (2) Operations Intelligence Automation
OIC
Officer in Charge
OICC
(1) Operational Intelligence Crisis Center; (2) Operational Intelligence Coordination Center
OICS
Operational Intelligence Collection System
OII
Operations-Intelligence Interface
OILO
Operations Intelligence Liaison Officer
OIP
(1) Offset Instrumentation Point; (2) Operator Interface Processor
OIR
Operational Intelligence Requirement
OISS
Operational Intelligence Support System
OIW
OII Workstation
OJCS
(1) Organization of the Joint Chiefs of Staff; (2) Office of the Joint Chiefs of Staff
OJT
On-the-Job Training
OL
Operating Location
OLC
Oak Leaf Cluster
OM
Operations Module
O&M
Operation and Maintenance
OMA
(1) Office of Military Affairs (CIA); (2) Operations and Maintenance, Army
OMAR
Operations and Maintenance Army Reserve
OMAT
Ocean Measurements and Array Technology
OMB
Office of Management and Budget
OMC
Office of Military Cooperation
OMC-K
Office of Military Cooperation-Kuwait
OMG
Operational Maneuver Group (FSU)
OMNG
Operation and Maintenance, National Guard
OMOB
Offensive Missile Order of Battle
OMV
Orbital Maneuvering Vehicle
ON
Original Negative (film)
ONA
Australia Office of National Assessments
ONC
Operational Navigation Chart
ONI
Office of Naval Intelligence
ONIR
Overhead Non-Imaging Infrared
ONLEXKED
On-Line Five Year Exercise Schedule System
ONOO
Outline NATO Operational Objective
ONPG
Operational Nuclear Planning Group
ONR
Office of Naval Research
ONS
Operational Needs Statement
ONUC
United Nations Operations in the Congo
ONUMOZ
United Nations Operations in Mozambique
ONUSAL
United Nations Observer Mission in El Salvador
OOA
Out of Area
OOB
Order of Battle
OODA
Observation, Orientation, Decision and Action
OOK
On/Off Keying
OOP
Object Oriented Programming
OOTW
Operations Other Than War
OP
(1) Observation Post; (2) Operation; (3) Operational
OPA
Other Procurement Activity
OP3
Overt Peacetime PSYOP Program
OPCC
Offutt Processing and Correlation Center
OPCEN
Operations Center
OPCODES
Operational Codes
OPCOM
Operational Command
OPCON
Operational Control
OPDEC
Operational Deception
OPEC
Organization of Petroleum-Exporting Countries
OPELINT
Operational Electronic Intelligence
OPF
Orbiter Processing Facility
OPFAC
Operational Facilities
OPFIS
Operational Foreign Instrumentation Signals
OPFOR
Opposing Forces
OPG
Operations Planning Group
OPI
Office of Primary Interest
OPIC
(1) Overseas Processing and Interpretation Center; (2) Overseas Private Investment Corporation
OPIC-A
Overseas Processing and Interpretation Center - Asia
OPINT
Optical Intelligence
OPINTEL
Operational Intelligence
OPLAN
Operations Plan
OPM
Office of Personnel Management
Opn(s)
Operation(s)
OPNAV
Office of the Chief of Naval Operations
OPNAVINST
OPNAV Instruction
OPNOTES
Operational Notes
OPORDER/OPORD
Operations Order
OPPAR
Opposing Army
OPR
Office(r) of Primary Responsibility; Officer Performance Report
OPREP
Operations Report
OPREPS
Operational Reporting System
OPS/OPNS/OP
Operations
OPS/INTEL
Operations Intelligence
OPSDEPS
Operations Deputies (JCS)
OPSCO
Operations Coordinator
OPSCOM
Operations Committee
OPSCOMM
Operations Secure Communications
OPSEC
Operations Security
OPSKAN
Open Skies Advanced Notice
OPSNOTE
Operations Note
OPT
(1) Optional Modification; (2) Operations Planning Team
OPTEMPO
Tempo of Operations
OPTEVFOR
Operational Test and Evaluation Force
OPTINT
Optical Intelligence
OPTIR
Optical Infrared
OPUS
OBU Program Upgrade System
OR
(1) Operational Requirements; (2) Operationally Ready
ORBINT
Orbital Intelligence
ORBIT
System Development Corporation Data Search Service
ORCON
(1) Dissemination and Extraction of Information Controlled by Originator; (2) Originator Controlled
ORD
Operational Requirements Document
ORE
Operational Readiness Exercise
ORF
Official Representation Fund
Org
Organization
ORI
Operational Readiness Inspection
OS
(1) Operating System; (2) Cryptologic Officer
O&S
Operations & Support
OSA
Open Systems Architecture
OSAP
Ocean Surveillance Assessment Program
OSAS
Operational Space Application System
OSC
(1) Office of the Security Council; (2) Operational
Support
Company; (3) Operations Support Center; (4) On-Scene
Commander
OSCAR
Optical Submarine Communications by Aerospace Relay
OSCARCP
Operations Support Center and Rear Command Post (Korea)
OSD
Office of the Secretary of Defense
OSD(C)
OSD (Comptroller)
OSF
Open Systems Foundation
OSI
(1) Operating Systems Incorporated (Contractor); (2) On-Site Inspection; (3) Off-Shore Islands; (4) Office of Special Investigations; (5) Open System Interconnect; (6) Office of Special Investigations; (7) Open System Interconnect
OSIA
On Site Inspection Agency
OSINT
Open Source Intelligence
OSIS
(1) Ocean Surveillance Information System; (2) Open Source Information Service
OSP
(1) Ocean Surveillance Product; (2) Operational Support Package
OSPRA
Ocean Surveillance Pattern Recognition Algorithm
OSO
Operational Support Office
OSP
Operational Support Packages
OSS
(1) Operational Storage Site; (2) Operations Support Squadron; (3) Operations Support System
OSSC
On-Line System Support Center
OST
Outer Space Treaty
OSTP
Office of Science and Technology Policy
OT
(1) Overseas Territories; (2) Overtime; (3) Operational Test; (4) One Time; (5) Operations Team
OT&E
Operational Test and Evaluation
OTA
(1) Operational Tasking Authority; (2) Office of Technology Assessment
OTAD
Over-The-Air Key Distribution
OTAR
Over-The-Air Rekeying
OTAT
Over-The-Air Transmission/Transfer
OTAU
Over-The-Air Updating
OTC
(1) Officer in Tactical Command; (2) Over-the-Counter
OTCIXS
(1) Officer in Tactical Command Information Exchange Subsystem; (2) OTC Information Exchange System
OTE
See OT&E
OTEA
Operational Test and Evaluation Agency (U.S. Army)
OTH
Over-the-Horizon
OTH-B
Over-the-Horizon Backscatter
OTH-R
Over-the-Horizon Radar
OTH-T
Over-the-Horizon Targeting
OTIS
Operational Targeting Intelligence System
OTM
On the Move
OTP
One-Time Pad
OTS
(1) One-Time Source; (2) Officer Training School; (3) Oahu Telecommunications System
OTT
One-Time Tape
OTU
Operational Training Unit
OUO
Official Use Only
OUSDRE
Office of the Under Secretary of Defense, Research &
Engineering
OUTS
Operational Unit Transportable System
OVOP
Overt Operational Proposal
OVPF
Object-Oriented Vector Product Format
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