For the invasion of Tinian, 24 July 1944, "Fuller" again staged a diversionary feint at landings, then landed her marines next day as reinforcements. She returned to Espiritu Santo 9 August with casualties, then loaded troops and cargo in the Russells for landing exercises on Guadalcanal. "Fuller" carried the same men to the assault on Peleliu on 15 September, and after offloading all her cargo and receiving casualties, sailed for Hollandia, arriving 25 September for drills in anticipation of the Leyte assault. She landed troops successfully in San Pedro Bay, Leyte, in the initial assault of 20 October, then sailed at once for Humboldt Bay to load reinforcements and supplies, with which she returned to San Pedro Bay 14 November.