| Acronym | Meaning |
 | ASDIC | Allied Submarine Detection Investigation Committee (Sonar) |
| FIFO | First In |
| CHL | Chile (ISO 3166 Trigram) |
| JOPES | Joint Operations Planning And Execution System |
| ASD(HA) | (U.S.) Assistant Secretary Of Defense (Health Affairs) |
| KUW | Kuwait (UNDP Country Code) |
| OR | Operating Room (surgery) - Operational/Operations Research -Oregon (postal Symbol) |
| NCW | Network Centric Warfare |
| JDEM | Joint Dark Energy Mission |
| SCN | Suprachiasmatic Nucleus |
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