2. A vessel which has one of the following characteristics: (a) mounts a gun with a calibre exceeding 4.7 inches (120 mm.); (b) mounts more than four guns with a calibre exceeding 3 inches (76 mm.); (c) is designed or fitted to launch torpedoes or to lay mines; (d) is designed or fitted to launch self-propelled or guided missiles; (e) is designed for protection by armour plating exceeding 1 inch (25 mm.) in thickness; (f) is designed or adapted primarily for operating aircraft at sea; (g) mounts more than two aircraft launching apparatus; (h) is designed for a speed greater than twenty knots if fitted with a gun of calibre exceeding 3 inches (76 mm.) . A war vessel belonging to sub-category 1 is no longer to be considered as such after the twentieth year since completion if all weapons are removed. Battleship A battleship is a war vessel, other than an aircraft carrier, the standard displacement of which exceeds 10,000 tons or which carries a gun with a calibre exceeding 8 inches (203 mm.) . Aircraft Carrier An aircraft carrier is a war vessel, whatever her displacement, designed or adapted primarily for the purpose of carrying and operating aircraft. Submarine A submarine is a vessel designed to operate below the surface of the sea. Specialised Types of Assault Craft 1. All types of craft specially designed or adapted for amphibious operations. 2. All types of small craft specially designed or adapted to carry an explosive or incendiary charge for attacks on ships or harbours. Motor Torpedo Boat A vessel of a displacement less than 200 tons, capable of a speed of over 25 knots and of operating torpedoes. 1464 [61 STAT. TREATIES
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