Victory at Sea: US Navy Submarines & MTB sectionsSubmarines: The Gato class of submarine was the first mass production US submarine class of the Second World War, forming the majority of the United States Navys submarine fleet of the war. It was the Gato class, and the successors of her design that were largely responsible for the disruption of the Japanese merchant fleet. Individual Gato class vessels were given names of marine creatures, with the lead of her class named for a type of small