Lilac’s significance as a naval vessel is indeed that she is the only surviving example of a vessel that once served a vital role in the navigable waters of every coastline of this country. She is unique in that she is the last unaltered steam propelled and steam hoisting lighthouse tender designed for work on the open sea and connecting bays and sounds. She is also the last such vessel to survive that was operated by the United States Lighthouse Service, the civilian manned agency responsible for maintaining aids to navigation from 1910 to 1939, when this work was assumed by the United States Coast Guard.

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