USS Nautilus by Shipshape on Sketchfab But the revolution came in 1954 with the launch of Nautilus, the world's first nuclear powered submarine. Widely used in testing, it proved the reliability of the system and was followed by the USS Seawolf, second SSN in 1955. The US Navy then took a step ahead by answering to the "November" class, quite unreliabe. The first series of SSNs dated from 1957-58: These were the four Skate, followed by six Skipjack. But the latter came into service in 1960-61 and only the USS Skipjack was on the lists in 1960. The nuclear strategy called for ballistic missile, and studies for submarines were launched soon. In 1954 the USS Grayback, a conventional-powered attack carrying two ramps for four4 Regulus-1 rockets was unveiled. It was followed by the USS Growler (1957) and USS Halibut (1959, completed in January 1960), the first US Navy SSBN. The first class of modern SSBN, the USS George Washington, will be completed during 1960-61. She had been preceded by two fleet-snorkel conversions to German V-1 missiles, USS Cusk and Carbonero, followed by USS Barbero and USS Tunny, Guppies converted to Regulus rockets. Finally, the US Navy developed the idea of underwater radar poles. She tried it with "Gato" converted, 10 in all, under the program code name of "Migraine", in three phases. They all returned to normal service in 1959. They built on this test base two SAs of this type, the Sailfish class (1955), followed by the SSN USS Triton in 1958, a very large boomer (136 meters and 7700 tons). USS Greenfish, converted in a GUPPY III (1960)
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