In mid-June, "Bougainville" was released from her replenishment duties, when she undertook a transport mission to bases located within the Philippines, before returning to Guam. After completing her mission, she steamed eastward, pausing at Pearl Harbor, before arriving back at San Diego, where she lay in port until early August for repairs and replenishment. On 9 August, she left San Diego, bound yet again for the West Pacific. En route, her crew received news of the Japanese surrender on 15 August. After stops at Pearl Harbor and Guam, she was anchored off of the island of Roi-Namur when the formal signing of the Japanese Instrument of Surrender was occurring on 2 September. There, she loaded inoperational aircraft, before heading back to Oahu. At Pearl Harbor, she took on a load of aircraft and passengers, departing port on 12 September, stopping at Apra Harbor, Guam, where she disembarked some passengers and took on additional aircraft. Continuing westwards, she anchored at Nakagusuku Bay on 27 September, before leaving harbor the following day to evade Typhoon Jean, which appeared to heading for the Okinawa Islands.