USS Surf (SP-518)

USS Surf (SP-518) was the proposed name and designation for a yacht that was offered to the United States Navy in 1917 but never commissioned. Surf was built as a civilian steam yacht in 1898 by Eamage and Ferguson at Leith, Scotland, in the United Kingdom. Her owner, J. A. Harris of New York City offered her to the U.S. Navy for use as a patrol vessel during World War I. The Navy assigned her the section patrol number SP-518 but never commissioned her, and returned her to Harris on 29 September 1917.