| Abbreviation | Definition |
|---|---|
| ETIC | Estimated Time For Completion |
| ETIC | Estimated Time In Commission |
| ETKF | Engaged Target Kalman Filter |
| ETKU | Electronic Transfer Keying Device |
| ETL | Endorsed Tools List |
| ETL | Engineering Technical Letter |
| ETM | Electronic Transmission |
| ETM | Extension Training Materials |
| ETMC | Enhanced Traffic Management Coordinator |
| ETMDS | Enterprise Training Management and Delivery System (US DoD) |
| ETN | Electronic Tandem Network |
| ETN1 | Electronics Technician (Nuclear Field) |
| ETO | European Theater Of Operations |
| ETO | European Theater of Operations [WW2] |
| ETP | exception to policy |
| ETP | Exportable Training Packages |
| ETP | Extended Tether Program ( U-2R) |
| ETP | Extended Trip Packs |
| ETPL | Endorsed TEMPEST Products List |
| ETR | Eastern Test Range |