| Abbreviation | Definition |
|---|---|
| ETR | Embedded Training Requirements |
| ETR | Estimated Time of Return |
| ETR | Export Traffic Release |
| ETRAC | Enhanced Tactical Radar Correlator |
| ETS | Elite Tactical Squad |
| ETS | End Term of Service |
| ETS | Estimated Termination of Service |
| ETS | Estimated Time to Sail |
| ETS | European Telephone System |
| ETS | Expiration of Term of Service |
| ETSG | Electronic Target Signature Generation |
| ETSS | Extended Training Service Specialist |
| ETUT | Enhanced Tactical Users Terminal |
| ETW | End Time Warriors |
| ETX | End of Text |
| EU | Enemy Unexpected |
| EU | European Union |
| E-UAV | Endurance - Unmanned Aerial Vehicle |
| E-UAV | Endurance Unmanned Aerial Vehicle |
| EUB | Essential User Bypass |