The Motoscafo Armato Silurante (Torpedo Armed Motorboat) is an Italian fast attack craft used during World War I and World War II to combat enemy submarines. Primary armaments included torpedoes and depth charges, and crew also manned a deck gun and heavy machine gun. MAS 15, a 30-ton boat that entered service in 1916, was credited with the sinking of the SMS Szent István, an Austro-Hungarian battleship. It is preserved at a museum on the grounds of Il Vittoriano in Rome, Italy.