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The second USS Elfin (SP-965) was a United States Navy patrol vessel in commission from 1917 to 1918. Elfin was built in 1911 as a private motorboat of the same name by at Lynn, Massachusetts. In July 1917, the U.S. Navy leased her from her owner, Alfred W. Gibbs of Wayne, Pennsylvania, for use as a section patrol boat during World War I. She was commissioned as USS Elfin (SP-965) on 26 July 1917. Assigned to the 4th Naval District, Elfin served on patrol duties through the end of World War I. Elfin was returned to Gibbs on 22 November 1918.