On 12 June 1945, "Thetis Bay" arrived at Pearl Harbor from San Diego with a load of aircraft. There, the aircraft were readied for combat within 72 hours, and the ship got underway for Guam. She arrived at Apra Harbor on 25 June and was assigned to Task Group 30.8 for duty as a replenishment carrier. "Thetis Bay" made her first rendezvous with Task Force 38 on 12 July when she transferred 40 planes to various carriers. She returned to Guam on 22 July and remained there until 24 July to load more aircraft before joining the fast carriers again on the 31st. The ship reloaded at Guam once more and resupplied the task force from 14 August to 8 September when she returned to Apra Harbor en route to the United States.