| Abbreviation | Definition |
|---|---|
| FDS | Fixed Distribution System |
| FDS | Flemish Death Squadron |
| FDS | Flight Data System |
| FDS | Functional Design Specification |
| FDSL | Fixed Directory Subscriber List |
| FDSS | Fault Detection Subsystem |
| FDSSS | Flight Deck Status and Signaling System |
| FDT | Forward Distribution Team |
| FDTA | Fish Drill Team Association |
| FDTB | Force Development Test Bed |
| FDTD | Finite Difference Time Domain |
| FDTE | Force Development Test and Experimentation |
| FDTSP | Foreign Disclosure and Technology Security Plan |
| FDU | Force Design Update |
| FDUL | Fixed Directory Unit List |
| FDX | Full Duplex |
| FE | Facilities Engineering |
| FEA | Front End Analysis |
| FEA | Front-End Analysis |
| FEAR | First Encounter Armed Reconnaissance |