After arriving on 8 January, until 17 January, when the escort carriers left Lingayen Gulf, "Shamrock Bay", aside from providing an air screen against kamikazes, also conducted flight operations in close support of the ground invasion. 571 sorties were logged by Composite Squadron 94, 180 of which were flown over Luzon. On 17 January, she joined Task Group 77.14 and sailed for Ulithi Atoll in the Caroline Islands, where she joined Task Unit 50.8.25, which was assigned to provide air cover for Task Group 50.8, the Logistics Support Group, which provided replacement aircraft, supplies, and replacement personnel to the Fast Carrier Task Force. On 16 February, she departed Ulithi, and she arrived off of Iwo Jima, along with the replenishment carriers, on 19 February, just as the first landings were taking place. Assigned to group Baker of the Logistics Support Group, she, along with was responsible for providing air cover for the aircraft deliveries of , , , and .