USS Harder (SS-568), 20-inch Mahogany Submarine Model. Enjoy this beautifully crafted USS Harder (SS-568), Tang Class, Mahogany Model. You’ll love the craftsmanship and the memories this model invokes. US Naval Aviator Owned Business. Construction and commissioning Harder’s keel was laid down by the Electric Boat Company in Groton, Connecticut, on 30 June 1950. She was launched on 3 December 1951, sponsored by Kay Logan Cole, the widow of Lieutenant S. Logan, executive officer of the submarine USS Harder (SS-257), lost during World War II. Harder was commissioned on 19 August 1952.