CSIB Views 7 meanings found CSIB may refer to the U.S. Army’s Combat Service Identification Badge, a research center for stable isotope biogeochemistry, or a commercial insurance brokerage, depending on the industry. Miscellaneous Combat Service Identification Badges Controlled Substances Inventory Board Governmental Combat Service Identification Badge Academic & Science Center for Stable Isotope Biogeochemistry Regional Canadian Sports Insurance Brokers Business Capital Shield Insurance Broker City Savings and Investment Bank