During World War II, "LST-553" was assigned to the Pacific Theater of Operations. She participated in the capture and occupation of the southern Palau Islands in September and October 1944. She then took part in the Philippines campaign, participating in the Leyte landings in October and November 1944, the Lingayen Gulf landings in January 1945, and the landings at Zambales and Subic Bay in January 1945. She then participated in the assault on and occupation of Okinawa Gunto from April through June 1945.