COMSUBIN (Comando Raggruppamento Subacquei e Incursori Teseo Tesei) is the elite combat frogman force and one of the Italian special forces. Italy was the first nation to use frogmen and human torpedoes. The Italian Naval Assault Divisions are considered to be the precursors to modern Naval Special Forces. Their record can be traced back to World War I and the operation against the Austrian-Hungarian Battleship Viribus Unitis in Pola Harbour in 1918. Other famous operations are Trieste, Suda Bay, Alexandria, Gibraltar, and Malta. Great Britain and Germany soon followed. Italy's frogman group originated in 1938 as the 1a Flottiglia Mezzi d'Assalto (1st Flotilla Assault Vehicles), which was reformed in 1940 as the Decima Flottiglia MAS (10th Flotilla Assault Vehicles, X MAS).