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The Sargo class of United States Navy submarine dates from 1939. The submarines had a length of 310.5 feet, with a complement of between 50 and 55 men. They were armed with eight torpedo tubes--4 front and 4 aft and one 3" deck gun. They had a top speed of 20 knots surfaced and 7.5 knots submerged. 10 boats of this class were built.
The Swordfish was the first United States submarine to sink a Japanese ship in World War II.
The Sargo class submarines were