| Abbreviation | Definition |
|---|---|
| ESI | European Simulation Internet |
| ESI | Extremely Sensitive Information |
| ESIHS | Expert System Information Handling System |
| ESJ | Escort Screening Jammer |
| ESK | Electronic Staff Weather Officer Kit |
| ESK | Elite Super Killers |
| ESL | Estimated Service Life |
| ESM | Electronic Sensing Measures |
| ESM | Electronic Support Measures |
| ESM | Emission Sensing Monitor |
| ESM | Expeditionary Site Mapping |
| ESMR | Expert Systems Message Router |
| ESN | Electronic Serial Number |
| ESO | Embarkation Staff Officer |
| ESO | Environmental Science Officer |
| ESO | Equipment Superior To Operator |
| ESOC | Emergency Supply Operations Center |
| ESOP | Enhanced Switch Operating Position |
| ESORTS | Enhanced Status of Resources and Training System |
| ESP | Electro Selective Pattern |