USS Dolphin (SF-10/SC-3/SS-169), a submarine and one of the "V-boats", was the sixth ship of the United States Navy to be named for that aquatic mammal. She also bore the name V-7 and the classifications SF-10 and SC-3 prior to her commissioning. She was launched on 6 March 1932 by the Portsmouth Navy Yard, sponsored by Mrs. E.D. Toland, and commissioned on 1 June 1932.
USS Dolphin underway on the surface.
Dolphin at the Underwater Sound School, Hawaii, circa 1940. Note motor boat aft of the sail.
The V-boats were a group of nine United States Navy submarines built between World War I and World War II from 1921 to 1934 under authorization as the "fleet boat" program.
V-boats (left to right): Cachalot, Dolphin, Barracuda, Bass, Bonita, Nautilus, Narwhal, with submarine tender Holland.