"Cook Inlet" arrived off Saipan on 26 February 1945 to serve with the escort and patrol group based there, and from 2 March 1945 to 14 March 1945 was on an air-sea rescue station during the invasion of Iwo Jima. "Cook Inlet" rescued 27 survivors of downed bombers. She was still on duty at Iwo Jima when hostilities with Japan ended on 15 August 1945, bringing World War II to a close.