The end of the war in the Pacific in August marked only the beginning of "Tracy"s participation in the gigantic minesweeping efforts in Japanese home waters. From Buckner Bay, the ship proceeded to Japan and she arrived in Nagasaki Wan on 11 September one of the first Allied ships to enter that expanse of water. She served as buoy-laying and mine-disposal vessel during the minesweeping operations which cleared the sea lanes outside that key seaport and continued these duties until late in October, when she sailed for home.