renumbered under the modern NOAA hull number system.

United States Lighthouse Service

Vessels commissioned by the United States Lighthouse Service (USLHS) were originally not given unique names or hull numbers. Instead, names were exchanged when a new vessel was assigned to a station. Lightships first received the hull code "LS" before being replaced by "LV" (lightvessel). When the USLHS was absorbed by the U.S. Coast Guard in 1939,

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