Dead Reckoning System 
Data Relay Satellite 
Deficiency Reporting System 
Data Reconstruction System 
Dresser 
Data Relay Station 
Detection and Ranging Set 
Diffuse reflectance spectroscopy 
Direct Receiving Station 
Discrepancy Reports 
Division of Radiation Safety 
Document Registration System 
Data and Reporting System 
Data Rate Select 
DATA RATE SELECTOR 
Data Record System 
Data Recording Subsystem 
Data Refinement System 
Data Retrieval System 
Dementia Rating Scale 
Depositary Receipts 
Dexterous Robotics System 
dielectric relaxation spectroscopy 
Digital Radar Simulator 
Digital Radio System 
Digital Range Safety 
Digital Reconfiguration Service 
DIGITAL REFERENCE SEQUENCE 
Digital Reference Signal 
Direct Recoil Spectroscopy