 Following stops at Kwajalein and Eniwetok, the tanker reached Saipan on 11 February 1945.During the next seven months, she shuttled between Saipan and Iwo Jima delivering fuel oil and aviation gasoline in support of U.S. Army Air Force operations on that island.Following the end of the fighting in mid-August, "Ammonusuc" carried medical supplies and other stores to working parties at Chichi Jima.