| Abbreviation | Definition |
|---|---|
| DET | Detached |
| DET | Detachment |
| DET | DETainee |
| DET | Displaced Equipment Training |
| DET | Distributed Explosive Technology |
| DETAS | Directed Energy Training Assessment Study |
| DETL | Digital Emulation Technology Laboratory |
| DETP | Displaced Equipment Transition Plan |
| DETRESFA | Distress Phase |
| DEU | Dress Uniform |
| DEUCE | Deployable Universal Combat Earthmover M105 |
| DEVA | Development-Validation |
| DEVGRU | Naval Special Warfare Development Group |
| DEW | Death's Elite Warriors |
| DEW | Directed Energy Weapon |
| DEW | Directed-Energy Warfare |
| DEW | Distant Early Warning |
| DEWIZ | Distance Early Warning Identification |
| DEWLINE | Distance Early Warning Line |
| DEWPOINT | Directed Energy Weapon Power Integration |