D
- DA – double action
- DAHA – dual-axis head assembly
- DAO – double action only
- DARCOM – US Army Matériel Development and Readiness Command
- DAREOD – damaged airfield reconnaissance explosive ordnance disposal
- DARPA – Defense Advanced Research Projects Agency (US)
- DAS – deep air support
- DAS – defensive aid system/suite
- DASP – demountable artillery surveillance pod
- DBMS - dead bodies make sense
- DC – direct current
- DCA – défense contre avions (anti-aircraft)
- DCCT – dismounted close combat trainer
- DD – Detroit diesel
- DDA – Detroit Diesel Allison
- DDS – Department of Defense Support
- DDU – digital display unit
- DECA – digital electronic control assembly
- DEFA – direction des études et fabrications d'armement
- DERA – Defence Evaluation and Research Agency (UK)
- DESO – Defence Export Sales Organisation (UK)
- DFAC – Dining Facility (US)
- DFCS – digital fire-control system
- DFSV – direct fire support vehicle
- DFV – desert fighting vehicle
- DHSS – data handling subsystem
- DIA – Defense Intelligence Agency (US)
- DICON – Defence Industries Corporation of Nigeria
- DIP – driver instrument panel
- DISA – Defense Information Systems Agency
- DISCOM – division support command
- DIVARTY – division artillery
- DMC – digital magnetic compass
- DMR – dedicated marksman rifle
- DMU – distance measurement unit
- DNRS – day/night range sight
- DoD – Department of Defense (US)
- DOIM (US Army) – Directorate of Information Management
- DOP – Department of Productivity
- DP – demonstration purpose
- DP – dual purpose
- DPA – Defence Procurement Agency (UK)
- DPICM – dual-purpose improved conventional munition (US)
- DPTR – diopter
- DRA – Defence Research Agency (UK)
- DROPS – demountable rack offloading and pick-up system
- DS/T – practice discarding sabot/tracer
- DSACS – direct support armored cannon system (US)
- DSETS – direct support electrical test system
- DSO – Defence Sales Organisation
- DSRV – Deep Submergence Rescue Vehicle (US)
- DSWS – Division Support Weapon System
- DTAT – Direction Technique des Armements Terrestres
- DTT – driver training tank
- DU – depleted uranium
- DV – demining vehicle
- DVE – driver's vision enhancer
- DWFK – deep water fording kit
Read more about this topic: Glossary Of Military Abbreviations