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A ballistic missile submarine is a submarine equipped to launch ballistic missiles (SLBMs), such as the Russian R-29 or the American/British Trident.
Although some early models had to surface to launch their missiles, modern vessels typically launch while submerged at depths usually less than 50 meters (164 feet). Ballistic missile submarines differ from attack submarines and cruise missile submarines; while attack submarines specialise in combat with other naval vessels (including enemy submarines and merchant shipping), and cruise missile submarines are designed to attack large warships and tactical targets on land, the primary mission of the ballistic missile is nuclear deterrence. Accordingly, the mission profile of a ballistic missile submarine concentrates on remaining undetected, rather than aggressively pursuing other vessels.
Ballistic missile submarines are designed for stealth, to avoid detection at all costs. They use several design features, such as anechoic tiles on their hull surfaces, carefully designed propulsion systems, machinery mounted on vibration damping mounts to remain undetected.
The need to accommodate SLBMs means that ballistic missile submarines are larger than all other classes of submarine. The most obvious examples of this were the later Russian Navy Delta III and IV classes, as well as the Typhoon-class submarines and the American Ohio-class submarines
SSBN is the United States Navy's hull classification symbol for a nuclear-powered, ballistic nuclear missile-carrying submarine. In, ballistic missile submarines are called "boomers", while in Britain, they are referred to as "bombers". (...) more....
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