 Soon recommissioned, after the outbreak of the Korean War, on 28 December 1950, "Mattaponi" served for almost four years as a Military Sea Transport Service vessel with the designation T‑AO‑41.Until June 1951 she operated primarily along the U.S. west coast, making one voyage to Japan in March.From June through September she carried fuel from Aruba to east coast ports, making one run to Iceland before returning to the west coast.