Upon reaching Guam on 6 January 1945, "Admiralty Islands" conducted training operations for two days, before sailing for Hawaii on 10 January. She reached Pearl Harbor on 20 January, where repairs were made to her main engine, finishing on 31 January. Upon the completion of repairs, she was assigned to become a replenishment carrier as a part of Task Group 50.8.4, the mobile replenishment group supporting the frontline Fifth Fleet. Replenishment carriers enabled larger fleet carriers to operate out at sea for extended periods of time without having to withdraw to port. She served alongside three other escort carriers, , , and . She took on a complement of sixty-one replacement planes at Pearl Harbor, and she left port on 2 February, bound for the waters off of Iwo Jima, in support of the planned landings there. After stopping at Eniwetok and Ulithi, she began replenishment operations on 16 February, continuing throughout the next five months.