Commonwealth of Independent States Combat Intelligence System Clinical Information System Center for Internet Security Central Index System CompuServe Information Service Combat Information System Combat Intelligence Systems Cancer Information Service Card Information Structure Computer Information Systems configuration items Citizenship and Immigration Services Cluster Ion Spectrometry Communications and Information Systems Canadian Ice Service Combat Identification System Corporate Information System Customer Information System Chemical Information System Client Information System Combat Instruction Set Communications Interface Shelter Component Identification Sheet Compuserve Information Systems Consumer Information Source Contact Image Sensor Contractor's Information Submittal Cryogenic Interferometer/Spectrometer Customized Intercept Service