| Abbreviation | Definition |
|---|---|
| ECS2 | Executive Control and Subordinate System |
| ECS-G | Engagement Control Station - Ground |
| ECSRK | Electrical Connector Supplemental Repair Kit |
| ECSU | Essential CONUS Support Unit |
| ECT | Elite Counter Terrorist |
| ECTS | Electronic Combat Training System |
| ECU | Environmental Control Unit |
| ECV | Engineering Change Variance |
| ECWSS | Extreme Cold Weather Sleep System |
| ED | Early Deployment |
| ED | Effective Date |
| ED | Effective Distance |
| ED | Electronic Defense |
| ED | Engineering Development |
| ED | Envelope Delay |
| ED | Evaluation Directive |
| ED | Evolutionary Development |
| EDA | Engineering Data Analysis |
| EDA | Excess Defense Articles |
| EDAS | Enlisted Distribution and Assignment System |