| Acronym | Meaning |
 | ORR | Oak Ridge Reservation (U.S. DOE) - Office Of Rail Regulation (UK Government) - Office Of Refugee Resettlement - (CIA) Office Of Research And Reports - Operational Readiness Rate - Operational Readiness Review |
| ORBAT | Order Of Battle |
| CU | Cuba (FIPS 10-4 Country Code; ISO 3166 Digram) |
| MLW | Mean Low Water (nautical Charts) |
| AMRAAM | Advanced Medium-Range Air-to-Air Missile |
| TCCCS | Tactical Command |
| SSDC | U.S. Space And Strategic Defense Command |
| EASA | European Aviation Safety Agency |
| WWIII | World War III |
| CATK | Counterattack |
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