High Quality Content by WIKIPEDIA articles! USS Cossatot (AO-77) was a United States Navy World War II Type T2-SE-A1 tanker which served as a fleet oiler. Launched as SS Fort Necessity on 28 February 1943 by the Sun Shipbuilding Dry Dock Co., Chester, Pennsylvania, under a Maritime Commission contract; sponsored by Mrs. W. Taylor; acquired by the Navy on 17 March 1943; and commissioned on 20 April 1943 Commander P. G. Beck, USNR, in command. It was named for a river in Arkansas.