| D |
| D&L (DL) | Doctrine and Literature |
| D-1 | Unit Designator for North Vietnamese Army Regiment |
| D/S | Direct Support |
| DA | Department of the Army |
| DADAC | Department of the Army Distribution Allocation Committee |
| Dai Viet | Greater Vietnam Nationalist Party |
| DAM | Damaged |
| DAME | Defense Against Mechanical Entry |
| DAML | Directorate of Army MAP Logistics |
| Dan Van | Literally translates to "action among the people" This program originated with the Viet Minh and was directed toward gaining popular support from the general population. During NLF days, the program was redefined and limited to the "liberated areas."
|
| DAO | Defense Attache Office |
| DART | Deployable Automatic Relay Terminal |
| DASC | Direct Air Support Center |
| DASD | Deputy Assistant Secretary of Defense |
| DASE | Defense Against Sound Equipment |
| DASH | Drone Antisubmarine Helicopter |
| DATT | Defense Attache |
| DAV | Defense Assistance, Vietnam |
| db | Decibels |
| DC | Damage Control |
| DC | Direct Current |
| DC/LOW | Frequencies Below Microwave |
| DCA | Defense Communications Agency |
| DCA | Directorate, Civil Aviation |
| DCA-PAC | Defense Communication Agency, Pacific Group |
| DCA-SAM | Defense Communications Agency-Southeast Asia Mainland |
| DCAT | Division Combat Assistance Team |
| DCDRLOG | Deputy Commander Logistics |
| DCG | Deputy Commanding General |
| DCM | Deputy Charge of Mission |
| DCNO | Deputy Chief of Naval Operations |
| DCO | Dial Central Office |
| DCO | District Central Office |
| DCofS | Deputy Chief of Staff |
| DCPG | Defense Communications Planning Group |
| DCS | Defense Communications System |
| DCS/LOG | Deputy Chief of Staff for Logistics |
| DCSCOMPT | Deputy Chief of Staff, Comptroller |
| DCSLOG | Deputy Chief of Staff, Logistics |
| DCSOPS | Deputy Chief of Staff for Operations |
| DCSPER | Deputy Chief of Staff Personnel (RVNAF Joint General Staff) |
| DD | Department of Defense |
| DD | Destroyer |
| DDG | Guided Missile Destroyer |
| DDR&E | Director, Defines Research land Engineering (OSD) |
| DE | Destroyer Escort |
| DEAR | Daily Enemy Activity Report |
| DED | Document Exploitation Division |
| DEF | Defense |
| DEFT | Drug Education Field Team |
| DEGN | Diethyleneglycol Denitraten |
| DEP DATT | Deputy Defense Attache |
| DEPAMB | Deputy Ambassador |
| DEPCG | Deputy Commanding General |
| DEPCOMTHD | Deputy Commander, TRAN HUNG DAO |
| DEPCOMUSMACTHAI | Deputy Commander United States Military Assistance Command, Thailand |
| DEPCOMUSMACV | Deputy Commander, United States Military Assistance Command, Vietnam |
| DEPCOMUSMACV for Air | Deputy Commander, United States Military Assistance Command, Vietnam, for Air |
| DEPCOMUSMACV for CORDS | Deputy Commander, United States Military Assistance Command, Vietnam, for Civil Operations and Rural Development Support |
| DEPCORDS | Deputy for Civil Operations and Rural Development Support |
| DEPSECDEF | Deputy Secretary of Defense |
| DEPSTATE | Department of State |
| DEPTEL | Department Telegram |
| DER | Radar Picket Destroyer Escort |
| DER | Radar Picket Escort Ship |
| DEROS | Date Eligible to Return from Overseas |
| Det | Destroyed/Detained |
| DET | Detachment |
| DF | Direction Finder/Finding |
| DF | Disposition Form |
| DFC | Distinguished Flying Cross |
| DFM | Diesel Fuel, Marine |
| DFS | Defile System |
| DFSC | Defense Fuels Supply Center |
| DGBFA | Director General for Budget and Foreign Aid |
| DGFA | Director General for Finance and Audit |
| DGNP | Director General National Police |
| DGOH | Director/Directorate General of Highways |
| DGON | Director General of Navy |
| DGOY | Director General of Youth |
| DGRR | Director/Directorate General for Rural Reconstruction |
| DGSC | Defense General Supply Center |
| DGWVA | Director General of War and Veterans Affairs |
| DI | Drill Instructor |
| DIA | Defense Intelligence Agency |
| DIA | Director of Intelligence |
| Dich Van | Literally translates to "action among the enemy." This program originated during the Viet Minh days and was originally directed against the enemy's military and civilian administration. As an NLF program, it was designed to gain popular support among the rural population in GVN-controlled areas.
|
| DIELIEM | Korean Contractor Based in Vietnam |
| DIFM | Due In for Maintenance |
| DINFOS | Defense Information School |
| DINS | Director for Inspection Services |
| DIOCC | District Intelligence and Operation Control/Coordination Center |
| DIRCON | Director of Construction |
| DIST | District |
| DISUM | Daily Intelligence Summary |
| DIT | Development Interteam |
| Div/DIV | Division |
| DLD | Dang Lao Dong The Workers' Party or Communist Party in North Vietnam. Often referred to as the Lao-Cong Party, it was formed on March 31, 1951 and eventually became the primary political party in North Vietnam.
|
| DLG | Guided Missile Frigate |
| DLI | Defense Language Institute |
| DLIELB | Defense Language Institute English Language Branch |
| DLILTD | Defense Language Institute, Language Training Detachment |
| DLIR | Downward Looking Infrared Radar |
| DLM | Depot Level Maintenance |
| DM | Adamsite |
| DMA | Data Management Agency |
| DMAC | Delta Military Assistance Command |
| DME | Distance Measuring Equipment |
| DMJM | Daniel, Mann, Johnson and Mendenhall |
| DMS | Distance Measuring System |
| DMZ | Demilitarised Zone |
| DNBI | Disease and Nonbattle Injuries |
| DOD | Department of Defense |
| DODAC | Department of Defense Ammunition Code |
| DODIC | Department of Defense Identification Card |
| DODMAN | Department of Defense Military Assistance Manual |
| DODT | Department of Defense, Transportation |
| DOI | Date of Identification |
| DOICC | Deputy Officer in Charge, Construction |
| DOICC | District Intelligence Coordination Center |
| Dong Khoi | Saturation Operation. |
| Dot - (aim dot, steering dot) | Electronic dot appearing in radar scope when radar is locked on providing computed steering vector information. |
| DOTS | Director General Technical Services |
| DRA | Dead Reckoning Analyzer |
| DRAC | Delta Regional Assistance Command |
| DRC | Defense Research Corp |
| DRCD | Director of Rural Construction and Development |
| DRSTO | Defense Resources Surveillance and Termination Office |
| DRT | Dead Reckoning Tracer |
| DRV (GNVN) | Democratic Republic of Vietnam (NVN) or Government of North Vietnam |
| DRVN | Democratic Republic of Vietnam. Often abbreviated DRV. Proclaimed as the official government of North Vietnam by Ho Chi Minh on September 2, 1945. |
| DS | Direct Support |
| DSA | Defense Supply Agency |
| DSA | Deputy/District Senior Advisor |
| DSC | Distinguished Service Cross |
| DSCS | Defense Satellite Communications System |
| DSG | Direct Support Group(s) |
| DSM | Distinguished Service Medal |
| DSP | Dependent Shelter Program |
| DSPG | Dependent Shelter Program Group |
| DSPO | Data System Project Officer |
| DST | Bomb Fitted With Magnetic Detonation Circuit |
| DST | Destructor |
| DST | District |
| DSTE | Digital Subscriber Terminal Equipment |
| DSU | Direct Support Unit |
| DSU/GSU | Direct Support Unit/General Support Unit |
| DT-1 | Unit Designator for North Vietnamese Army Regiment |
| DTA | Division Tactical Area |
| DTC | Division Training Center |
| DTE | Dial Telephone Exchange |
| DTG | Date Time Group |
| DTOC | Division Tactical Operations Center |
| DTP | Delta Transportation Plan |
| DUFFLE BAG | Electronic Sensing Devices; the US Sensor Program |
| DUSTOFF | US Army Aeromedical Evacuation Helicopter Units; an Aeromedical Helicopter Evacuation |
| DX | Direct Exchange |
| DYNALECTRON | Dynalectron, Inc |
| DZ | Drop Zone |