| Abbreviation | Definition |
|---|---|
| DEA | Drug Enforcement Administration |
| DEM | Domestic Enemy Marxist |
| DEO | Department of External Operations |
| DESECO | DEvelopment of SElected COntacts |
| DETCOM | DETention of COMmunists |
| DFI | Digital Forensic Investigator |
| DIA | Defense Intelligence Agency |
| DID | Domestic Intelligence Division |
| DIO | Duty Intelligence Officer |
| DIS | Defense Investigative Service |
| DL | Dallas Field Office |
| DMP | Domestic Monitor Program |
| DMSS | Data Mining Surveillance System |
| DN | Denver Field Office |
| DNB | Death, Non Battle |
| DNC | Dedicated Nazi Criminals |
| DOA | Decomposition Odor Analysis |
| DOB | Date Of Birth |
| DOD | Department Of Defense |
| DODI | Department Of Defense Instruction |