U.S. Military Abbreviations & Acronyms:  O

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