| D/L | Downlink |
| D&E | Design and Engineering |
| DA | Distribution Amplifier |
| DAA | Deputy Assistant Administrator |
| DAA | Designated Approval Authority |
| DAAS | Deputy Assistant Administrator Systems |
| DAB | Data Archive Board (NESDIS) |
| DAC | Digital to Analog Converter |
| DAC | Discretionary Access Control |
| DACA | days after contract award |
| DACO | Defense Administrative Contract Officer |
| DADDS | DCS Alternate Data Distribution System |
| DAI | Developer Anomaly and Improvement |
| DAL | Data Accession List |
| DAMS | Data Acquisition and Monitoring Subsystem (DCS) |
| DANCE | Detailed ANalysis of Critical Events (GSP Planning) |
| DAO | Department Administrative Order |
| DAP | Delivered Algorithm Package |
| DAPS | Data Collection System (DCS) Automatic Processing System |
| DAR | Decision Analysis and Resolution |
| DAR | Designated Acquisition Representative |
| DARB | Data Acquisition Review Board |
| DARTS | Digital Advance Ranging with Transport Range Signals |
| DAS | Data Acquisition System |
| DAS | Directly Attached Storage |
| DASHO | Designated Agency Safety and Health Official |
| dB | decibel |
| DBDD | Data Base Design Document |
| DBDM | Dual Band Data (LM-KO) |
| DBMS | Database Management System |
| dBpT | Decibel pico-Tesla |
| dBu | Micro Decibel |
| DC | Digital Count |
| DCAA | Defense Contract Auditing Agency |
| DCC | Deep Convective Clouds |
| DCCT | Deep Convective Cloud Technique |
| DCFM | Data Center Fabric Manager |
| DCLMA | District of Columbia Lightning Mapping Array |
| DCMA | Defense Contract Management Agency |
| DCMC | Defense Contract Management Command |
| DCN | Document Change Notice/Control Number |
| DCNM | Data Center Network Manager |
| DCOMP | Daytime Cloud Optical and Microphysical Properties |
| DCP | Data Collection Platform |
| DCPC | Data Collection Platform Commands |
| DCPI | Data Collection Platform Interrogation |
| DCPR | Data Collection Platform Report |
| DCR | Document Change Record |
| DCRB | Delivery Content Review Board |
| DCS | Distributed Control System |
| DCS | Data Collection System |
| DCS-GES | DCS Ground Equipment Set |
| DD | Data Deliverable |
| DD | Description Document |
| DD | Design Description |
| DD | Detailed Design |
| DDL | Design Definition Language |
| DDoS | Distributed Denial of Service |
| DDR | Data Delivery Report (CLASS) |
| DDR | Detailed Design Review |
| DDTC/DTC | Directorate of Defense Trade Controls [/DOS] which administers ITAR |
| DE | Data Engineer |
| DE | Detection Efficiency |
| DE | Development Environment |
| deg | degree |
| DEM | Differential Emission Measure |
| DEM | Digital Elevation Model |
| DES | Data Exchange Service |
| DESA | Defense Evaluation Support Activity |
| Dev&I | Development and Integration |
| DEWG | Data Engineering Working Group |
| DF | Data Fabric |
| DF | Data Formatter |
| DFD | Data Flow Diagram |
| DFP | Digital Front-end Processor |
| DFT | Discrete Fourier Transform |
| DGTLS | Diagnostic Tools |
| DHB | Discrete Heartbeat |
| DHCP | Dynamic Host Configuration Protocol |
| DIACAP | Department of Defense Information Assurance Certification and Accreditation Process |
| DICF | Division Inventory Control Function |
| DID | Data Item Description |
| DIF | Data Information Flag |
| DiffServ | Differentiated Services |
| DIR | Defense Meteorological Satellite Program Incident Report |
| DISTM | Detailed Integrated Satellite Thermal Model |
| DIT | Dynamic Interaction Test |
| DITE | Development, Integration and Test Environments |
| DITL | Day-In-The-Life |
| DITZ | Development environment, Integration and Test Zone |
| DLC | Data Link Connection Identifier |
| DLFM | Domain Level Fault Management |
| DLOC | Delivered/Developed Line of Code |
| DLR | Downward Longwave Radiation |
| DM | Data Management |
| DM | Data Model |
| DMAP | Data Management and Analysis Plan |
| DMC | Dynamic Motion Compensation |
| DMI | Data Model Interface |
| DMI | Direct Method Invocation |
| DML | Database Manipulation Language |
| DMR | Design Modification Review |
| DMS | Document Management System |
| DMSP | Defense Meteorological Satellite Program |
| DMW | Derived Motion Winds |
| DMWA | Derived Motion Winds Algorithm |
| DNS | Domain Name Service |
| DNSSec | Domain Name System Security |
| DO | Data Operations |
| DOC | Department of Commerce |
| DOCTREE | Document Tree |
| DoD | U.S. Department of Defense |
| DOD | Depth of Discharge |
| DoDAAC | DOD Activity Address Code |
| DOE | Data Operations Exercise |
| DOE | Department of Energy |
| DOF | degrees of freedom |
| DOI | Digital Object Identifier |
| DOM | Data Operations Manager |
| DOORS | Dynamic Object Oriented Requirements System |
| DOP | Data Operations Procedure |
| DoS | Denial of Service |
| DOST | Data Operations Support Team |
| DOT | Data Operations Test |
| DOT | Delivery and Operational Transition |
| DP | Derived Product |
| DP | Data Processor |
| DPA | Destructive Physical Analysis |
| DPA | Differential Power Analysis |
| DPI | derived product image |
| DPM | Deputy Project Manager |
| DPMR | Deputy Project Manager Resources |
| DPR | Dual-frequency Precipitation Radar |
| DPU | Data Processing Unit |
| DPXR | Diplexor Transceiver |
| DQF | Data Quality Flag |
| DR | Decommissioning Review |
| DR | Discrepancy Report |
| DR | Disposal Review |
| DRAC | Dell Remote Access Controller |
| DRB | Design Reference Baseline |
| DRD | Data Requirement Description |
| DRFP | Draft Request for Proposal |
| DRGS | Direct Readout Ground Station (DCS) |
| DRH | Design Reference Handbook |
| DRM | Design Reference Mission |
| DRM | Disaster Recovery Manager |
| DRP | Design Review Program |
| DRS | DRS Technologies |
| DS | Data Sharing |
| DS | Delegation Signer |
| DS | Digital Signal |
| DSA | Data Source Adaptors |
| DSCC | Defense Supply Center Columbus |
| DSCP | DiffServ Code Point |
| DSE | Data Service Element |
| DSLOC | Delivered Source Lines of Code |
| DSN | Deep Space Network |
| DSP | Digital Signal Processing |
| DSPD | Deputy System Program Director |
| DSR | Downward Shortwave Radiation |
| DSS | Digital Signature Standard |
| DST | Decision Support Tool |
| DST | Deploy Software and Tables |
| DSU | Data Synchronization Unit |
| DTED | Digital Terrain Elevation Data |
| DTO | Data Transport Object |
| DTO | Detailed Test Objectives |
| DTWT | Data Transfer Workload Table |
| DU | Dobson Unit |
| DUS | Deputy Under Secretary |
| DUT | Data Under Test |
| DVB-S2 | Digital Video Broadcasting – Second Generation |
| DVD | Digital video disk; digital versatile disk |
| DWG | Drawing |
| DWSS | Defense Weather Satellite System |