Distributed Interactive Simulation 
Division of Information Systems 
Defense Investigative Service 
Draft International Standard 
Distributorless Ignition System 
Data and Information System 
Digital Identification Signal 
Datapac Information Service 
Direct Ignition System 
Defense Information System 
Distributed Interactive Simulations 
Distributive Interactive Simulation 
Data Information System 
Department of Information Services 
Digital Information Signal 
disagree 
Documentation Index System 
daily intelligence summary 
Data and Information Systems 
Data Interface System 
Data Interpretation System 
Deep Inelastic Scattering 
Defence Industrial Strategy 
Defense Information Systems 
Demon Internet Systems 
Designated Intermediate System 
Digital Integration System 
Digital Interface Service 
Director of the Intelligence Staff 
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