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| id | abbr | meaning |
|---|---|---|
| 7901 | OPS/INTEL | Operations Intelligence |
| 7902 | OPSDEPS | Operations Deputies (JCS) |
| 7903 | OPSCO | Operations Coordinator |
| 7904 | OPSCOM | Operations Committee |
| 7905 | OPSCOMM | Operations Secure Communications |
| 7906 | OPSEC | Operations Security |
| 7907 | OPSKAN | Open Skies Advanced Notice |
| 7908 | OPSNOTE | Operations Note |
| 7909 | OPT | Optional Modification |
| 7910 | OPT | Operations Planning Team |
| 7911 | OPTEMPO | Tempo of Operations |
| 7912 | OPTEVFOR | Operational Test and Evaluation Force |
| 7913 | OPTINT | Optical Intelligence |
| 7914 | OPTIR | Optical Infrared |
| 7915 | OPUS | OBU Program Upgrade System |
| 7916 | OR | Operational Requirements |
| 7917 | OR | Operationally Ready |
| 7918 | ORBINT | Orbital Intelligence |
| 7919 | ORBIT | System Development Corporation Data Search Service |
| 7920 | ORCON | Dissemination and Extraction of Information Controlled by Originator |
| 7921 | ORCON | Originator Controlled |
| 7922 | ORD | Operational Requirements Document |
| 7923 | ORE | Operational Readiness Exercise |
| 7924 | ORF | Official Representation Fund |
| 7925 | Org | Organization |
| 7926 | ORI | Operational Readiness Inspection |
| 7927 | OS | Operating System |
| 7928 | OS | Cryptologic Officer |
| 7929 | O&S | Operations & Support |
| 7930 | OSA | Open Systems Architecture |
| 7931 | OSAP | Ocean Surveillance Assessment Program |
| 7932 | OSAS | Operational Space Application System |
| 7933 | OSC | Office of the Security Council |
| 7934 | OSC | Operational |
| 7935 | Support | Company |
| 7936 | Support | Operations Support Center |
| 7937 | Support | On-Scene |
| 7938 | Commander | |
| 7939 | OSCAR | Optical Submarine Communications by Aerospace Relay |
| 7940 | OSCARCP | Operations Support Center and Rear Command Post (Korea) |
| 7941 | OSD | Office of the Secretary of Defense |
| 7942 | OSD(C) | OSD (Comptroller) |
| 7943 | OSF | Open Systems Foundation |
| 7944 | OSI | Operating Systems Incorporated (Contractor) |
| 7945 | OSI | On-Site Inspection |
| 7946 | OSI | Off-Shore Islands |
| 7947 | OSI | Office of Special Investigations |
| 7948 | OSI | Open System Interconnect |
| 7949 | OSI | Office of Special Investigations |
| 7950 | OSI | Open System Interconnect |
| 7951 | OSIA | On Site Inspection Agency |
| 7952 | OSINT | Open Source Intelligence |
| 7953 | OSIS | Ocean Surveillance Information System |
| 7954 | OSIS | Open Source Information Service |
| 7955 | OSP | Ocean Surveillance Product |
| 7956 | OSP | Operational Support Package |
| 7957 | OSPRA | Ocean Surveillance Pattern Recognition Algorithm |
| 7958 | OSO | Operational Support Office |
| 7959 | OSP | Operational Support Packages |
| 7960 | OSS | Operational Storage Site |
| 7961 | OSS | Operations Support Squadron |
| 7962 | OSS | Operations Support System |
| 7963 | OSSC | On-Line System Support Center |
| 7964 | OST | Outer Space Treaty |
| 7965 | OSTP | Office of Science and Technology Policy |
| 7966 | OT | Overseas Territories |
| 7967 | OT | Overtime |
| 7968 | OT | Operational Test |
| 7969 | OT | One Time |
| 7970 | OT | Operations Team |
| 7971 | OT&E | Operational Test and Evaluation |
| 7972 | OTA | Operational Tasking Authority |
| 7973 | OTA | Office of Technology Assessment |
| 7974 | OTAD | Over-The-Air Key Distribution |
| 7975 | OTAR | Over-The-Air Rekeying |
| 7976 | OTAT | Over-The-Air Transmission/Transfer |
| 7977 | OTAU | Over-The-Air Updating |
| 7978 | OTC | Officer in Tactical Command |
| 7979 | OTC | Over-the-Counter |
| 7980 | OTCIXS | Officer in Tactical Command Information Exchange Subsystem |
| 7981 | OTCIXS | OTC Information Exchange System |
| 7982 | OTE | See OT&E |
| 7983 | OTEA | Operational Test and Evaluation Agency (U.S. Army) |
| 7984 | OTH | Over-the-Horizon |
| 7985 | OTH-B | Over-the-Horizon Backscatter |
| 7986 | OTH-R | Over-the-Horizon Radar |
| 7987 | OTH-T | Over-the-Horizon Targeting |
| 7988 | OTIS | Operational Targeting Intelligence System |
| 7989 | OTM | On the Move |
| 7990 | OTP | One-Time Pad |
| 7991 | OTS | One-Time Source |
| 7992 | OTS | Officer Training School |
| 7993 | OTS | Oahu Telecommunications System |
| 7994 | OTT | One-Time Tape |
| 7995 | OTU | Operational Training Unit |
| 7996 | OUO | Official Use Only |
| 7997 | OUSDRE | Office of the Under Secretary of Defense, Research & |
| 7998 | Engineering | |
| 7999 | OUTS | Operational Unit Transportable System |
| 8000 | OVOP | Overt Operational Proposal |
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