| Abbreviation | Definition |
|---|---|
| FDE | Force Deployment Estimator |
| FDE | Force Development Experimentation |
| FDE | Fort Detrick Engineering |
| FDE | Functional Data Element |
| FDED | Fort Detrick Engineering Directorate |
| FDEFO | Fort Detrick Engineering Field Office |
| FDEO | Fort Detrick Engineering Office |
| FDESC | Force Description |
| FDF | Finnish Defence Forces |
| FDF | First Digitize Force |
| FDF | Float Dampening Factor |
| FDFMOD | Finnish Defence Forces modification for Operation Flashpoint |
| FDL | FAAD (Forward Area Air Defense) Data Link |
| FDL | Fast Deployment Logistics |
| FDL | Fighter Data Link |
| FDLP | Flight Deck Landing Practice |
| FDLR | Forces démocratiques de libération du Rwanda |
| FDM | Flavell Rod and Divett Julian and Jaqueline Mountfield |
| FDM | Frequency Division Multiplexing |
| FDM | Frequency-Determining Module |