USS Cassin Young (DD-793), a Fletcher-class destroyer, was a ship of the United States Navy named for Captain Cassin Young (1894-1942), who was awarded the Medal of Honor after Pearl Harbor and killed in the Naval Battle of Guadalcanal. Cassin Young (DD-793) was launched 12 September 1943 by Bethlehem Steel Corp., San Pedro, California; sponsored by Mrs. C. Young; and commissioned 31 December 1943, Commander E. T. Schrieber in command.

The Navy's largest machine gun in WW II, it was capable of 160 rounds per minute, but was later removed from service because it was relatively ineffective against jet aircraft.

40 mm Gun

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