USS Whistler (SP-784)
USS "Whistler" (SP-784) was a United States Navy patrol vessel in commission from 1917 to 1919. "Whistler" was built as a private motorboat of the same name by J. E. Graves at Marblehead, Massachusetts, in 1917. On 17 May 1917, the U.S. Navy acquired her from her owner, Lawrence F. Percival of Boston, Massachusetts, for use as a section patrol boat during World War I. She was commissioned as USS "Whistler" (SP-784) on 31 July 1917. Assigned to the Boston Section of the 1st Naval District, "Whistler" operated from the naval districts headquarters at the Commonwealth Pier  in Boston on harbor entrance patrols for the rest of World War I. She occasionally served as a dispatch boat, carrying messages to and from other boats patrolling the harbor entrance. She also stood by the new submarine USS "O-5" (Submarine No. 66) while "O-5" conducted pre-commissioning submergence and sea trials on 30 May 1918. "Whistler" was decommissioned on 19 May 1919 and stricken from the Navy List the same day. She was sold to J. E. Doherty of Boston on 20 June 1919.