| Abbreviation | Definition |
|---|---|
| EST | Embarked Security Team |
| EST | Emergency Service Team |
| EST | Emergency Support Team (FEMA) |
| EST | En Route Support Team |
| EST | Environmental System Testing |
| EST | Equipment Specific Training |
| EST | Estimate |
| ESTA | Enterprise Systems Technology Activity |
| ESTARS | Electronic Suspense Tracking and Routing System |
| E-STARS | Electronic Suspense Tracking and Routing System |
| ESTD | Electric Ship Technology Demonstrator |
| ESU | Electrical Safety Upgrade |
| ESU | Elite Strike Unit |
| ESWAT | Every Single Weapon Attracts Terrorists |
| ESWAT | Every Soldier Wonders About Technology |
| ESWS | Enlisted Surface Warfare Specialist |
| ET | Electronic Trigger |
| ET | Embedded Training |
| ET | Engineering Test |
| ET | Equivalent Training |