Editing Hull classification symbol (section)

=== United States Revenue Cutter Service and United States Coast Guard ===
The [[United States Revenue Cutter Service]], which merged with the [[United States Lifesaving Service]] in January 1915 to form the modern [[United States Coast Guard]], began following the Navy's lead in the 1890s, with its [[United States Coast Guard Cutter|cutters]] having parenthetical numbers called [[Naval Registry Identification Number]]s following their names, such as (Cutter No. 1), etc. This persisted until the Navy's modern hull classification system's introduction in 1920, which included Coast Guard ships and craft.