U.S. Navy ammunition ships are frequently named for volcanos. During World War II, U.S. Navy ammunition ships were converted from merchant ships or specially built on merchant ship hulls, often of type C2. They were armed, and were manned by Navy crews. Several of them were destroyed in spectacular explosions during the war. Notable among them was USS Mount Hood, which exploded in the Admiralty Islands on November 10, 1944. These ships are being replaced by the Lewis and Clark class dry cargo ships.