| Acronym | Meaning |
| NRU | Nauru (ISO 3166 Trigram) |
| EROS | Earth Resources Observation System |
| RFA | Restrictive Fire Area (military) - Royal Field Artillery |
| EA | Electronic Attack - Engagement Area - Electronic Arts - Environmental Assessment -Exaampere |
| DA | Denmark (FIPS 10-4 Country Code) -U.S. Department Of The Army - District Attorney |
| POSH | Port Outbound Starboard Home (alleged) |
| CISA | (U.S.) C4I Integration Support Activity |
| PAHO | Pan American Health Organization |
| OJT | On-the-Job Training |
| RWA | Rwanda (ISO 3166 Trigram) |