Japanese ships has different type of vessels including Cruisers (type of warship), Minesweepers and Tugboats.
A cruiser is a type of warship. Heavy cruiser Light cruiser Minesweeper It includes submarines, battleships, oilers, minelayers and other types of Japanese sea vessels of war and naval ships used during wartime. Official designation was high-powered tugboat, however, they did not have any towing facilities. They were actually gunboat and escort ships. Gunboat 
