Cohocton was launched 28 June 1945 by Marinship Corp., Sausalito, California, under a Maritime Commission contract; sponsored by Mrs C. O. Day; commissioned 25 August 1945 and reported to the Pacific Fleet.
Cohocton sailed from San Francisco, California, on 5 September 1945 for Eniwetok, carrying ammunition and fresh water. She supported occupation forces in the Far East and western Pacific by carrying water from one port to another and serving as station water tanker. She called at Guam, Ulithi, Samar, Leyte, Yokosuka, Wakayama, and Kagoshima before arriving at Qingdao, China, on 10 January 1946, for station duty until 21 April. She returned by way of San Pedro, California, and the Panama Canal to Mobile, Alabama, where she was decommissioned on 14 June 1946 and returned to the War Shipping Administration the same day.
Cohocton was reacquired by the Navy and operated by a civilian company under contract to the Navy Transportation Service.
She was reassigned to Military Sea Transportation Service on 1 October 1949; reinstated in the Naval Register and placed in-service as USNS Cohocton (T-AO-101). Placed out-of-service, (date unknown); struck from the Naval Register, (date unknown); transferred to MARAD for lay up in the National Defense Reserve Fleet, (date unknown).
Cohocton was withdrawn from the reserve fleet on 27 September 1967 and transferred to the Hudson Waterways Corporation as part of the MARAD Exchange Program, and renamed SS Transoneida, IMO 6120965. The ship was converted to container ship in 1969. Upon completion of the conversion she was sold to the C.T.I. Corporation on 16 September 1969 and began hauling containerized cargo for Seatrain Lines between U.S. west coast ports and Hawaii, Guam and other U.S. Pacific territories. In 1974 Transoneida was leased to Matson, Inc. when Seatrain sold its Hawaiian operations to the Hawaiian-based shipping company. She was sold for scrapping to the Keun Hwa Iron & Steel Work Enterprise, Ltd., Taiwan, on 29 July 1980.