The most impressive submarines in the U.S.
The Navy currently has three different types: ballistic missile, strike missile and cruise missile.
The U.S. Navy ballistic missile submarine USS Pennsylvania (SSBN 735) travels through the Hood Canal as it returns home following a strategic deterrence patrol Oct. 16, 2014, in Puget Sound, Wash. (DoD photo by Chief Mass Communication Specialist Ahron Arendes, U.S. Navy/Released)
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