Union's entry into the Pacific War the same day. Two days after her arrival at San Diego on 12 August, further welcome news arrived, telling that Japan had accepted the unconditional surrender terms of the Potsdam Declaration and had capitulated. As a result of this development, Walter X. Young'''s original orders, calling for her embarked UDT personnel to take part in the projected invasion of Japan, were cancelled. Instead, the ship received a different mission. On 16 August, Walter X. Young embarked the 93 men of UDT 22 and after sunset on that date, sailed for the Hawaiian Islands. Arriving at Pearl Harbor on the morning of 22 August, she fueled and provisioned to capacity, loaded UDT explosives, and got underway on the afternoon of the 23rd for Japan. Her group steamed via the Marshall Islands, arrived in Tokyo Bay on 4 September, and reported to Vice Admiral Theodore S. "Ping" Wilkinson, Commander, 3rd Amphibious Force. With the group now reconstituted as Task Group 32.2 (TG 32.2), as two further APDs and their embarked UDTs joined, they awaited their assignments. The dock areas at Yokohama, the scene for one of the major initial occupation landings, were found to be in good condition, suitable for immediate use. Thus, they did not require reconnoitering by the UDTs for possible mines or other obstructions. Midway through her stay in Tokyo Bay, Walter X. Young was buffeted about by a typhoon. With high winds and seas, she dragged her anchor and eventually shifted anchorage to the lee side of the bay. During the height of the tempest, the APD received word from the cruiser that one of Youngs boats, an LCP(R) which had been loaned to the cruiser, had broken away and been lost. When the storm cleared however, the "missing" craft was seen riding at a painter astern of the cruiser and later was recovered intact. On 20 September, the ship's waiting period ended. In company with , Walter X. Young got underway on that date for Aomori, on the northern end of Honshū, to conduct a reconnaissance and beach survey, and to clear any obstacles that might impede Army landings. The two APDs escorted on this short voyage. While en route on the 21st, the American warships sighted a floating mine and sank it with rifle fire. Upon arrival at Mutsu Kaiwan on the 22nd, Gantner proceeded to Ominato to pick up