Sheridan arrived off Tarawa early in the morning of 20 November 1943 and began debarking troops shortly before noon and cargo in mid-afternoon.

Sheridan participated in practice landings at Oceanside, California, from 15 to 17 December 1943, and then welcomed the new year, 1944, with more exercises at San Clemente from 1 to 5 January.

After a week of amphibious training at Maui from 1 to 7 September, Sheridan departed Pearl Harbor on the 15th, and, after stops at Eniwetok and Manus, arrived on 20 October in the transport area off Leyte where she put her troops ashore in the first waves.

After remaining there from 27 October to 5 November, she arrived at Noemfoor Island on the 7th to load Army Air Force personnel and equipment, which she delivered at Leyte on the 18th.

There, she combat-loaded Army troops; and then underwent extensive training in amphibious operations, moving to Huon Gulf, New Guinea for the final rehearsal on the 19th.

The force encountered heavy air opposition during the approach on 8 January 1945, but Sheridan arrived unscathed and landed her troops early the next day.

There, she embarked troops, and, after a landing rehearsal on 25 January, put them ashore on the 29th at La Paz, Philippine Islands, which turned out to be under the control of friendly guerrillas.

The transport anchored in San Pedro, P.I., on 1 February and remained there until late March while the war moved closer to the Japanese homeland.

The ship entered Tokyo Bay as the surrender document was being signed on board battleship USS Missouri (BB-63), and offloaded her troops on 3 September.

Sold by the Maritime Commission to the United States Lines on 24 October 1947, she was briefly named Pioneer Sun and then served as American Scientist from 1947 until damaged by an explosion in July 1969 and scrapped.