| Abbreviation | Definition |
|---|---|
| DCII | Defense Central Index of Investigations |
| DCIIS | Defense Counter-Intelligence Information System |
| DCINC | Deputy Commander In Chief |
| DCIO | Defense Criminal Investigative Organization |
| DCIP | Defense Critical Infrastructure Program |
| DCIS | Defense Criminal Investigative Service |
| DCIS | Defense Criminal Investigative Services |
| DCJTF | Deputy Commander, Joint Task Force |
| DCLI | Duke of Cornwall's Light Infantry |
| DCM | Data Channel Multiplexer |
| DCM | Director of Civilian Marksmanship |
| DCMA | Defense Contract Management Agency |
| DCMAO | Defense Control Management Area Operations |
| DCMC | Defense Contract Management Command |
| DCMC | Office of the Deputy Chairman, Military Committee |
| DCMH | Defence Community Mental Health |
| DCMO | Deputy Chief Military Observer |
| DCN | Document Change Notice |
| DCNO | Deputy Chief of Naval Operations |
| DCNS | Deputy Chief of Naval Staff |