Ammunition ship
An ammunition ship is a warship specially configured to carry ammunition, usually for Navy ships and aircraft. Their cargo handling systems, designed with extreme safety in mind, include ammunition hoists with airlocks between decks, and mechanisms for flooding entire compartments with sea water in case of emergencies. They most often deliver their cargo to other ships using underway replenishment, using both connected replenishment and vertical replenishment. To a lesser extent, they transport ammunition from one shore-based weapons station to another.
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 attack cargo ships were used in the ammunition ship role, in spite of their lacking some of the specific ammunition ship safety features.
Contemporary U.S. ammunition ships are specially designed for their mission, which also includes carrying dry and refrigerated cargo. They include facilities for carrying and landing large helicopters. These ships are unarmed and are manned by civilian crews.
During World War II, several ammunition ships were involved in spectacular explosions. Notable among them was USS Mount Hood (AE-11), which exploded in the Admiralty Islands on November 10, 1944.