Coast Guard Sector Long Island Sound was established on May 31, 2005 by consolidating CG Group/MSO Long Island Sound and Coast Guard Group Moriches. CG Sector Long Island Sound performs all of the traditional marine safety duties plus the traditional missions of a Coast Guard Group.
Coast Guard operations for Long Island Sound, including the south shore of Long Island and along coastal Connecticut are coordinated from a single command center located at Sector Long Island Sound, on the eastern side of New Haven Harbor. Nine other fields subunits, strategically located throughout the Sound, work for this office. This includes approximately 500 active duty, 200 reservists, and 1200 volunteer CG Auxiliary members.