Mopang was a Sub Boats type (EFC Design 1023) cargo steamship built in 1920 by the Submarine Boat Co shipyard in Newark, New Jersey owned by Electric Boat Company (later General Dynamics). The ship was produced as part of a special program of the US Shipping Board that provisioned 150 identical ships to compensate for the losses from the war. The vessel sank on July 1, 1921 after hitting a mine near the port of Burgas.