The 81st Infantry Division landed in Hawaii, 11 June-8 July 1944. The division minus Regimental Combat Team (RCT) 323 invaded Angaur Island in the Palau group, as part of the Palau Islands campaign 17 September, and pushed through to the western shore in a quick movement, cutting the island in half. The enemy was driven into isolated pockets and mopping-up operations began on 20 September. RCT 321, attached to the 1st Marine Division, went into action on Peleliu Island in the Palaus and assisted in splitting defense forces and isolating them in mountainous areas in the central part of the island. The team aided in mopping up Ngesebus Island and capturing Kongauru and Garakayo Islands. RCT 323 under naval task force command occupied the Ulithi atoll, 21–23 September 1944. Elements of the team landed on Ngulu Atoll and destroyed enemy personnel and installations, 16 October, completing the outflanking of the enemy base at Yap. On 18 October, RCT 323 left to rejoin the 81st on Peleliu, which assumed command of all troops on that island and Angaur, 20 October 1944. Resistance was ended on Peleliu, 27 November. Between 4 November 1944 and 1 January 1945, the division seized Pulo Anna Island, Kyangel Atoll, and Pais Island. The 81st left in increments from 1 January to 8 February for New Caledonia for rehabilitation and training. The division arrived in Leyte on 17 May 1945, and after a period of training participated in mopping-up operations in the northwest part of the island, 21 July 1945 to 12 August 1945. After rest and training, the 81st moved to Japan, 18 September, and performed occupation duties in Aomori Prefecture until inactivation.