The United States Navy has - and continues to keep - a lengthy, established list of hull classification types.
The following is a list of current, officially-recognized, ship hull designations utilized by the United States Navy as provided through the Naval Ship Register. The classifications are generally representative of a given ship's role such as a Patrol Craft being 'PC'. Others, such as a Dock Landing Ship, are written as 'LSD' and Tank Landing Ship follows as 'LST'. Ships like Destroyers and Frigates carry a double-letter identifier as in 'DD' and 'FF', respectively. To mark the change-over to nuclear-powered propulsion (from conventional power), warship types have introduced 'N'. For example Aircraft Carrier (originally marked as 'CV') became 'CVN'. Nuclear-powered submarines evolved from the 'SS' classification to 'SSN'. The hull classification precedes the hull number as in USS Seawolf (SSN-21).
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