| Abbreviation | Definition |
|---|---|
| E&EE | Emergency and Extraordinary Expense |
| E&I | Engineering and Installation |
| E&M | Ear & Mouth |
| E&MD | Engineering and Manufacturing Development |
| E&V | Evaluation and Validation |
| E1 | Echelon 1 |
| E2 | Echelon 2 |
| E2I | Exoatmoshperic/ Endoatmoshperic Interceptor |
| E2O | Expeditionary Energy Office |
| E3 | Echelon 3 |
| E3 | Electromagnetic Environmental Effects |
| E3 | Electronic Environment Effects |
| E3A | Electronic Environment Effects Analysis |
| E4 | Echelon 4 |
| E5 | Echelon 5 |
| E-8C | Joint Surveillance, Target Attack Radar System (JSTARS) Aircraft |
| EA | Early Action |
| EA | Economic Analyses |
| EA | Electronic Attack |
| EA | Emergency Action |