Defense Dissemination System 
Data Distribution System 
Data Display System 
Differential Doppler Shift 
Distributed Defense Simulation 
Dry Deck Shelter 
Dual Driver Service 
Data Distribution Systems 
Defense Distribution System 
Deployment Debrief System 
Development Documentation System 
Direct Deposit System 
Director of Dental Services 
Directorate of Information Services 
Display and Debrief Subsystem 
Distributed Data Server 
Distributed Database System 
Distributed Denial of Service 
Document Design System 
Dynamic Distribution System