"Cacapon" served as station tanker successively at Efate and Espiritu Santo, New Hebrides; Port Purvis on Florida Island in the Solomons; and Manus, Admiralty Islands, until 8 January, when she cleared Manus for Ulithi. Here she reported to the 3rd Fleet, and between 12 and 27 January her operations supported task force TF-38 during its series of strikes against Luzon and Formosa supporting the Philippine attacks and consolidation. "Cacapon" lengthened the list of operations to which she had given vital support as she steamed with the 5th Fleet during the Iwo Jima operation, from 15 to 26 February, and the Okinawa operation from 24 March to 30 June. Between these, she served briefly as station tanker in San Pedro Bay, Philippine Islands.