Skate-class submarine
 The Skate-class submarines were the United States Navy's first production run of nuclear-powered submarines. They were an evolution of the Tang class in everything but their propulsion plants which were based on the experimental USS Nautilus. The four Skate class boats re-introduced stern torpedo tubes. Although among the smallest nuclear-powered attack submarines ever built the Skate class served for several decades with the last being decommissioned in 1989.