High Quality Content by WIKIPEDIA articles! Chateau Thierry was a troop transport that served with the US Army and US Navy. Originally built for service during the First World War, the ship arrived too late to see service in that war, but operated as an army transport, USAT Chateau Thierry, between the wars. With America`s entry into World War II, the vessel was transferred to the US Navy and redesignated USS Chateau Thierry (AP-31). In 1943 she was transferred back to the Army and converted into a hospital ship, USAHS Chateau Thierry, in which role she was to serve for the remainder of the war.