"Abnaki" remained there through the end of hostilities. Early in October, she shifted north to join the forces occupying Japan. That mission lasted through the end of 1945 and the first six months of 1946. On 6 July, the fleet tug departed Japanese waters and proceeded to China. Following a stop at Okinawa en route, she arrived at Shanghai on 16 July and began operations between that port and Tsingtao in support of American forces in China. On 24 October, she received orders sending her to the Mariana Islands. She arrived at Guam during the second week in November and provided towing service between the Marianas and the Admiralties through the end of the year. After February 1947, the Commander, Service Force, Pacific Fleet, expanded her sphere of operations to include ports in Japan and in China. The latter ports, however, were closed to her after the communist revolution in 1949.