[National Geographic] The Largest Submarine in The U.S. Navy

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The Largest Submarine in The U.S. Navy. Capable of staying under for 6 months, and going 20 years without refueling.

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USS Pennsylvania is a United States Navy Ohio-class ballistic missile submarine which has been in commission since 1989. The Ohio class is a class of nuclear powered submarines used by the United States Navy. The Navy has 18 Ohio-class ballistic missile submarines and guided missile submarines.
 
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