A vessel (generally of considerable size and sophistication) specifically constructed for the afloat support of combatant warships. Such vessels typically incorporate features of warship construction (including damage control and action information systems, and facilities for helicopter operations), and may be armed. They should be distinguished from Requisitioned craft which may be used for similar purposes.
Such vessels have become more numerous since the Second World War and may be divided between Replenishment Vessels and Depot Ships. The former are the more numerous, are intended for the rapid supply of fuel and dry stores at sea, and carry prominent fuelling rigs for the purpose. The latter are intended to make a fleet self-sufficient by providing comprehensive repair and maintenance facilities away from major naval bases.
