This United States Coast Guard USCG Commandant Publication, COMDTPUB P3120.17B U.S. Coast Guard Incident Management Handbook, is designed to assist Coast Guard personnel in the use of the National Incident Management System (NIMS) Incident Command System (ICS) during response operations and planned events. The IMH is an easy reference job aid for responders. It is not a policy document, but rather guidance for response personnel.