USS Impetuous (PYc-46) was a private yacht purchased by the Navy in August 1940 that served as a patrol boat of the United States Navy in Central America. The yacht was built as Paragon, the first of at least two Davol yachts to bear the name, in 1915 for Charles J. Davol of Providence, Rhode Island. In 1916 Davol sold the yacht to John Fred Betz, 3d of Philadelphia who renamed the yacht Sybilla III which served as the Section Patrol yacht USS Sybilla III (SP-104) from May 1917 to December 1918. Sybilla III remained in Betz's ownership until sale in 1935 to R. Livingston Sullivan of Philadelphia who renamed the yacht Arlis. On 12 August 1940 the Navy purchased the yacht placing it in commission as USS PC-454 on 16 October. The vessel was given the name Impetuous and reclassified PYc-46 on 15 July 1943. The yacht was decommissioned at Philadelphia 31 August 1944 and transferred to the War Shipping Administration for sale.
USS Narada (SP-161) was a steam yacht that served in the United States Navy as a patrol vessel from 1917 to 1919.
USS Winchester (SP-156) was an armed yacht that served in the United States Navy as a patrol vessel from 1917 to 1919. Prior to and following World War I, Winchester was a private yacht, later renamed Renard. In World War II, Renard was requisitioned for use in the Royal Canadian Navy as a patrol vessel, keeping her name. She was returned to her owners in 1944.
USS Christabel (SP-162) was a civilian steam yacht that was built in Glasgow in 1893 for a Scottish industrialist. She had an American owner by 1910, served as a United States Navy patrol ship in the latter part of the First World War, and afterward was returned to US civilian service.
USS Emeline (SP-175) was a yacht acquired by the U.S. Navy during World War I. She was outfitted with military equipment, including 3-inch guns, and was commissioned as a patrol craft, assigned to protect shipping in the North Atlantic Ocean. She saved the lives of survivors of shipwrecks, and provided escort protection from German submarines for commercial ships. Post-war she was sold to the highest bidder, who had the yacht sail to San Diego, California, for delivery.
USS Halcyon II (SP-582) was a yacht acquired by the U.S. Navy during World War I. She was outfitted as an armed patrol craft and stationed in Boston harbor in Massachusetts. She spent much of the war patrolling the Massachusetts waterways for German submarines and, in 1919, was decommissioned after being damaged in a collision.
USS Wacondah (SP-238) was an advanced-design yacht acquired by the U.S. Navy during World War I. She was outfitted as an armed patrol craft assigned to guard the New York City harbor against German submarines and to provide escort protection to commercial ships. Post-war she was sold and continued her maritime career as the yacht Intercolonial.
USS Helenita (SP-210) was a yacht leased from its owner by the U.S. Navy during World War I. She was outfitted as an armed patrol craft and initially assigned to North Atlantic Ocean duty, but found to be too lightly built for the ocean. She was then relegated to patrol of Long Island Sound and the Delaware Bay until war's end, when her guns were removed and she was returned to her owner.
USS Zoraya (SP-235) was an armed yacht that served in the United States Navy from 1917 to 1919.
USS Gem (SP-41) was an armed yacht that served in the United States Navy as a patrol vessel from 1917 to 1919.
USS Chichota (SP-65) was an armed yacht that served in the United States Navy as a patrol vessel from 1917 to 1918.
USS Joyance (SP-72) was an armed yacht that served in the United States Navy as a patrol vessel from 1917 to 1919.
The third USS Mohican (SP-117), later USS SP-117, was an armed yacht that served in the United States Navy as a patrol vessel from 1917 to 1919.
Aphrodite was a yacht built to requirements by owner Colonel Oliver H. Payne of New York City as an ocean going steam yacht with barque rig and capable of good speed under sail alone. The yacht was launched 1 December 1898 and completed in 1899 to be the largest American built steam yacht at the time. The yacht served in the United States Navy as the patrol vessel USS Aphrodite from May 1917 to July 1919. The yacht was given the designation SP-135 for Section patrol and was, unlike the majority of section patrol vessels, sent overseas rather than acting in that capacity in home waters. The yacht was returned to private service after the war.
USS Owera (SP-167), was an armed yacht that served in the United States Navy as a patrol vessel from 1917 to 1919. The vessel, under the name O-We-Ra, was built as a steam yacht in Leith, Scotland in 1907 for Frederick H. Stevens of Buffalo, New York. In 1915 the yacht was sold to United States Senator Peter G. Gerry of Rhode Island and registered in Providence, Rhode Island as Owera.
The second USS Sovereign (SP-170) was an armed yacht that served in the United States Navy as a patrol vessel from 1918 to 1919.
The first USS Sabalo (SP-225) was a United States Navy patrol vessel in commission from 1917 to 1919. Following World War I, Sabalo was sold to private interests before returning to service as a patrol vessel in World War II, this time with the Royal Canadian Navy, renamed Cougar. Returning to private ownership following the war, the vessel sank in a hurricane in 1950.
The third USS Seneca (SP-427), later USS SP-427, was a United States Navy minesweeper and patrol vessel in commission from 1917 to 1919.
USS Linta (SP-721) was a United States Navy patrol vessel in commission from 1917 to 1919.
USS Talofa (SP-1016) was a United States Navy patrol vessel in commission from 1917 to 1919.
