In October and November 1943 "Saturn" made one transatlantic crossing to England, and then resumed supply trips between the US and Caribbean until September 1944. In April 1944 Norfolk Navy Yard converted her to a provision store ship and on 10 April she was reclassified AF-40. While in the Norfolk Navy Yard on April 27, 1944, a fire broke out in the hold, resulting in the death of 16 men working on the ship. This accident remained classified until 2010. On 2 September 1944 "Saturn" sailed to the Mediterranean carrying supplies for Operation Dragoon, the invasion of southern France. After one trip to Iceland and several voyages to the Caribbean, she made another trip to Oran, French Algeria in March 1945. "Saturn" resumed her supply voyages up and down the Atlantic Coast until arriving at Norfolk, Virginia on 1 July 1946.