"Chincoteague" arrived at Guam on 13 February 1945 to join the assault force bound for Iwo Jima, and on 20 February 1945, arrived off the bitterly contested island to tend seaplanes until 8 March 1945. Similar operations at Ulithi Atoll followed until 8 June 1945, when she sailed for an overhaul on the United States West Coast, where she was when World War II ended with the cessation of hostilities with Japan on 15 August 1945.