An attack submarine or hunter-killer submarine is a submarine specifically designed for the purpose of attacking and sinking other submarines, surface combatants and merchant vessels. In the Soviet and Russian navies they were and are called "multi-purpose submarines".[1] They are also used to protect friendly surface combatants and missile submarines.[2] Some attack subs are also armed with cruise missiles, increasing the scope of their potential missions to include land targets.
Attack submarines may be either nuclear-powered or diesel-electric ("conventionally") powered. In the United States Navy naming system, and in the equivalent NATO system (STANAG 1166), nuclear-powered attack submarines are known as SSNs and their anti-submarine (ASW) diesel-electric predecessors are SSKs. In the US Navy, SSNs are unofficially called "fast attacks".
^Gorshkov (1979), p. 55.
^"Attack Submarine Info". US Navy. Retrieved August 17, 2012.
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