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| id | abbr | meaning |
|---|---|---|
| 7801 | OER | Operational ELINT Requirements |
| 7802 | OET | Office of Emergency Transportation |
| 7803 | OFC | Office |
| 7804 | OFCO | Offensive Counterintelligence Operation |
| 7805 | Off | Officer |
| 7806 | OFM | Office of Foreign Mission |
| 7807 | OGOOI | Operations Group Operations Officer Intelligence (Air Force) |
| 7808 | OGS | Overseas Ground Station |
| 7809 | OGSI | Operations Group Support Intelligence (Air Force) |
| 7810 | OHD | Over-the-Horizon Detection Radar |
| 7811 | OHD-B | Over-the-Horizon Detection Radar-Backscatter |
| 7812 | OI | Operating Instruction |
| 7813 | OI | Operational Interest |
| 7814 | O&I | Operations & Intelligence |
| 7815 | OIA | Office of Imagery Analysis |
| 7816 | OIA | Operations Intelligence Automation |
| 7817 | OIC | Officer in Charge |
| 7818 | OICC | Operational Intelligence Crisis Center |
| 7819 | OICC | Operational Intelligence Coordination Center |
| 7820 | OICS | Operational Intelligence Collection System |
| 7821 | OII | Operations-Intelligence Interface |
| 7822 | OILO | Operations Intelligence Liaison Officer |
| 7823 | OIP | Offset Instrumentation Point |
| 7824 | OIP | Operator Interface Processor |
| 7825 | OIR | Operational Intelligence Requirement |
| 7826 | OISS | Operational Intelligence Support System |
| 7827 | OIW | OII Workstation |
| 7828 | OJCS | Organization of the Joint Chiefs of Staff |
| 7829 | OJCS | Office of the Joint Chiefs of Staff |
| 7830 | OJT | On-the-Job Training |
| 7831 | OL | Operating Location |
| 7832 | OLC | Oak Leaf Cluster |
| 7833 | OM | Operations Module |
| 7834 | O&M | Operation and Maintenance |
| 7835 | OMA | Office of Military Affairs (CIA) |
| 7836 | OMA | Operations and Maintenance, Army |
| 7837 | OMAR | Operations and Maintenance Army Reserve |
| 7838 | OMAT | Ocean Measurements and Array Technology |
| 7839 | OMB | Office of Management and Budget |
| 7840 | OMC | Office of Military Cooperation |
| 7841 | OMC-K | Office of Military Cooperation-Kuwait |
| 7842 | OMG | Operational Maneuver Group (FSU) |
| 7843 | OMNG | Operation and Maintenance, National Guard |
| 7844 | OMOB | Offensive Missile Order of Battle |
| 7845 | OMV | Orbital Maneuvering Vehicle |
| 7846 | ON | Original Negative (film) |
| 7847 | ONA | Australia Office of National Assessments |
| 7848 | ONC | Operational Navigation Chart |
| 7849 | ONI | Office of Naval Intelligence |
| 7850 | ONIR | Overhead Non-Imaging Infrared |
| 7851 | ONLEXKED | On-Line Five Year Exercise Schedule System |
| 7852 | ONOO | Outline NATO Operational Objective |
| 7853 | ONPG | Operational Nuclear Planning Group |
| 7854 | ONR | Office of Naval Research |
| 7855 | ONS | Operational Needs Statement |
| 7856 | ONUC | United Nations Operations in the Congo |
| 7857 | ONUMOZ | United Nations Operations in Mozambique |
| 7858 | ONUSAL | United Nations Observer Mission in El Salvador |
| 7859 | OOA | Out of Area |
| 7860 | OOB | Order of Battle |
| 7861 | OODA | Observation, Orientation, Decision and Action |
| 7862 | OOK | On/Off Keying |
| 7863 | OOP | Object Oriented Programming |
| 7864 | OOTW | Operations Other Than War |
| 7865 | OP | Observation Post |
| 7866 | OP | Operation |
| 7867 | OP | Operational |
| 7868 | OPA | Other Procurement Activity |
| 7869 | OP3 | Overt Peacetime PSYOP Program |
| 7870 | OPCC | Offutt Processing and Correlation Center |
| 7871 | OPCEN | Operations Center |
| 7872 | OPCODES | Operational Codes |
| 7873 | OPCOM | Operational Command |
| 7874 | OPCON | Operational Control |
| 7875 | OPDEC | Operational Deception |
| 7876 | OPEC | Organization of Petroleum-Exporting Countries |
| 7877 | OPELINT | Operational Electronic Intelligence |
| 7878 | OPF | Orbiter Processing Facility |
| 7879 | OPFAC | Operational Facilities |
| 7880 | OPFIS | Operational Foreign Instrumentation Signals |
| 7881 | OPFOR | Opposing Forces |
| 7882 | OPG | Operations Planning Group |
| 7883 | OPI | Office of Primary Interest |
| 7884 | OPIC | Overseas Processing and Interpretation Center |
| 7885 | OPIC | Overseas Private Investment Corporation |
| 7886 | OPIC-A | Overseas Processing and Interpretation Center - Asia |
| 7887 | OPINT | Optical Intelligence |
| 7888 | OPINTEL | Operational Intelligence |
| 7889 | OPLAN | Operations Plan |
| 7890 | OPM | Office of Personnel Management |
| 7891 | Opn(s) | Operation(s) |
| 7892 | OPNAV | Office of the Chief of Naval Operations |
| 7893 | OPNAVINST | OPNAV Instruction |
| 7894 | OPNOTES | Operational Notes |
| 7895 | OPORDER/OPORD | Operations Order |
| 7896 | OPPAR | Opposing Army |
| 7897 | OPR | Office(r) of Primary Responsibility; Officer Performance Report |
| 7898 | OPREP | Operations Report |
| 7899 | OPREPS | Operational Reporting System |
| 7900 | OPS/OPNS/OP | Operations |
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