Combat Intelligence System 
Clinical Information System 
Combat Information System 
Combat Intelligence Systems 
Communications and Information Systems 
Combat Identification System 
Combat Instruction Set 
Communications Interface Shelter 
Computer and Information Science 
common item support 
Communication and Information System 
Communication and Information Systems 
Communications and Information System 
Critical Incident Stress 
Canadian Intelligence Service 
Capital Investment Strategy 
CASE Information Services 
case integration services 
Category of Identified Signals 
Center for Comparative and Internation… 
Chief, Intelligence and Security 
Combat Instructor School 
Combined Influence Sweep 
Commercial Industrial Support 
Common Interface Standard 
Communications Information System 
Communications Intercept System 
Communicators and Information Systems 
Company Inforamtion System 
Company Information System