lightships were reassigned "WAL" for "anchored light" and "WLV" using the Coast Guard's "W" prefix. Finally, all lightships took the "WLV" designation after 1965 until the entire fleet was retired.

The modern hull classification system

United States Navy

The U.S. Navy instituted its modern hull classification system on 17 July 1920, doing away with section patrol numbers, "identification numbers", and the other numbering systems described above. In the new system, all hull classification symbols are at least two

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