SSN (hull classification symbol)  From Wikipedia, the free
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navigation, search  An SSN is a nuclear-powered general-purpose
attack submarine. SSN is the US Navy hull classification symbol
for such vessels; the SS denotes a submarine[1] and the N
denotes nuclear power. The designation SSN is used not just in
the USN, but throughout NATO under STANAG 1166.[2]   The first
nuclear-powered attack submarine was the US Navy's USS Nautilus
operational from 1954. This was followed by the four submarines
of the Skate class entering service in 1957. The Royal Navy's
first nuclear fleet submarine was HMS Dreadnought which by using
an American reactor entered service in 1963. The first all-
British nuclear submarines were the two Valiant class
submarines.  The US Navy (USN) submarine fleet has been all-
nuclear powered for over two decades. The bulk of the USN's SSN
fleet has been the Los Angeles-class attack submarine. Designed
during the Cold War the Los Angeles cla