Under a bareboat charter by the United States Maritime Commission, "Agwileon" carried civilian technicians and advisors to Sierra Leone for the U.S. Army. In November 1942, the ship was taken over by the Army as USAT "Agwileon" and converted to a troopship, making one trip in that capacity. In June 1943, the ship was selected for conversion to an Army hospital ship, and was renamed USAHS "Shamrock". Operating locally in the Mediterranean for most of her career, the ship had transported almost 18,000 patients by September 1944. The ship was converted for use in the Pacific Theatre, but not before the war ended. The ship was placed in reserve in February 1946, and was scrapped in February 1948.