| Abbreviation | Definition |
|---|---|
| FDB | Fire Down Below |
| FDB | Functional Description of the Battlefield |
| FDBM | Functional Database Manager |
| FDC | Facility Design Criteria |
| FDC | Fire Direction Center |
| FDC | First Digitized Corps |
| FDC | Fleet Division Chief |
| FDD | First Digitized Division |
| FDD | Floppy Disk Drive |
| FDD | Force Design and Development |
| FDD | Force Design Directorate |
| FDD | Functional Dds Denoted |
| FDD | Functional Decomposition Design |
| FDD | Functional Design Document |
| FDDI | Fiber Distributed Data Interface |
| FDDM | Fire Direction Data Management (or Manager) |
| FDDM | Fire Direction Data Manager |
| FDDM | Fire Direction Dissemination Module |
| FDDM | Fire Support Digital Data Manager |
| FDDS | Flag Data Display System |