"Alcyone" completed unloading at sea on 2 August and set sail for Guam to replenish. While the ship was in the Marianas, Japan capitulated. "Alcyone" rejoined the logistics group on 23 August; and, three days later, she and her consorts entered Tokyo Bay. After unloading, "Alcyone" left Japan and returned to Guam to take on more cargo and supplies. She arrived back in Tokyo Bay on 1 October and began replenishing ships of the occupation forces.