| Abbreviation | Definition |
|---|---|
| EI | Environmental Information |
| EI | Exercise Item |
| EI | Extra Instruction |
| EI&K | evidence, information and knowledge |
| EI/WS | End Item/Weapons System |
| EIA | Electronic Industries Association |
| EIB | Expert Infantryman Badge |
| EIBU | Enhanced Interference Blanker Unit |
| EIC | End Item Code |
| EIC | Equipment Identification Code |
| EID | Electrically Initiated Device |
| EIDE | Enhanced Integrated Drive Electronics |
| EIDS | Electronic Information Delivery System |
| EIDWS | Enlisted Information Dominance Warfare Specialist |
| EIE | Equipment Inventory Evaluation |
| EIEB | Enhanced Initial Enlistment Bonus |
| EIEIO | Engineering Instruction/Engineering Implementation Order |
| EIEIO | Environmentally Integrated Effects Initiatives for Operations |
| EIEMA | Enterprise Information Environment Mission Area (ASD NII) |
| EIFS | Economic Impact Forecast System |