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This site contains a comprehensive list of U.S. military terms and definitions.

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
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
OGS I 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
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
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