USS Captor (PYc-40), briefly the seventh ship to bear the name USS Eagle (AM-132), was a Q-ship of the United States Navy.
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 Amethyst (PYc-3) was the yacht Samona II taken into service in the United States Navy serving as a patrol boat during World War II. After military service the vessel was returned to civilian status in 1946 and again became the yacht Samona II until sale and subsequent names of Pudlo and Explorer.
USS Onyx (PYc-5), was a diesel coastal patrol yacht of the United States Navy during World War II.
USS Amber (PYc-6) was a patrol boat in the United States Navy during World War II, built at Long Beach, California in 1930 as the yacht Infanta for the actor John Barrymore.
USS Aquamarine (PYc-7) was the former yacht Siele launched in April 1926 by Pusey and Jones Corporation, Wilmington, Delaware. In 1940 Siele was sold and renamed Sea Wolf which was purchased by the Navy in January 1941 and commissioned Aquamarine in April. Though given a "patrol yacht, coastal" designation the yacht was assigned to the Naval Research Laboratory for acoustical research during World War II. After naval service the yacht was again under the name Sea Wolf until sold in 1954 and renamed Miss Ann, listed on the U.S. National Register of Historic Places in 1998.
The first USS Persistent (PYc-48) was a submarine chaser of the United States Navy.
The American motor yacht Haida was built in Germany in 1929 for Max C. Fleischmann and later saw service in the United States Navy during World War II as patrol yacht USS Argus (PY-14) and USC&GS Pioneer. In 1946 she returned to her role as a private yacht under a sequence of names and owners, and after a further refit in 2016 is now Haida 1929.
USS Moonstone (PYc-9) was a coastal patrol yacht in the service of the United States Navy. She was built in 1929 as Nancy Baker by Germaniawerft in Kiel, Germany, later renamed Mona, and subsequently acquired by the Navy as the Lone Star on 10 February 1941. Renamed Moonstone and designated PYc-9, she was converted for U.S. Navy service in Jacksonville, Florida, and commissioned on 10 April 1941. She was named for the gemstone moonstone.
USS Cymophane (PYc-26) was a Cymophane-class patrol yacht acquired by the United States Navy early during World War II. She was used for patrol, escort, anti-submarine, and rescue operations along coastal waters.
USS Sturdy (PC-460/PYc-50) was a yacht converted to a patrol boat acquired by the U.S. Navy for the task of patrolling the coastal waters of the U.S. East Coast during World War II. Her primary task was to guard the coastal area against German submarines.
USS Sardonyx (PYc-12), formerly the yacht named Queen Anne (1928), was a patrol boat in the United States Navy during World War II.
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 USS Alabaster (PYc-21) was a coastal patrol yacht of the United States Navy during World War II.
USS Valiant (PYc-51), originally USS PC-509, was a United States Navy patrol vessel in commission from 1941 to 1944.
USS Garnet (PYc-15) was a coastal patrol yacht in the service of the United States Navy.
USS Jade (PY-17), was a yacht in commission in the United States Navy as a Patrol Yacht from 1940 to 1945. The vessel was constructed as the yacht Athero II for Jesse Lauriston Livermore in 1926, then sold to Eldridge R. Johnson to be renamed Caroline until replaced by a much larger vessel, also named Caroline, in 1931. The smaller yacht was sold to Joseph M. Schenck of Los Angeles and New York, briefly, before being sold John R. Brinkley, M.D. of Del Rio, Texas, and renamed Doctor Brinkley. In 1940, the US Navy purchased her and renamed her Jade, after the ornamental mineral jade; she is the only Navy ship to bear this name.
USS Topaz (PYc-10) was a coastal patrol yacht in the service of the United States Navy. She was named for the gemstone Topaz.
HMCS Sans Peur was an armed yacht that served with the Royal Canadian Navy (RCN) during World War II on both coasts. The vessel was constructed as a yacht in 1933 for Ernest G. Stanley at the John I. Thornycroft & Company yard in Woolston, Southampton, United Kingdom and initially named Trenora. It was sold in the 1930s to George Sutherland-Leveson-Gower, 5th Duke of Sutherland who renamed it Sans Peur. The yacht was taken over by the RCN in 1939 and used for anti-submarine patrols and training duties on the British Columbia Coast. In 1944, Sans Peur was brought east to Nova Scotia as a training ship.
MV Star of Malta was a passenger ferry which operated routes from Malta to Sicily in the 1950s and 1960s, notable for its sinking off Malta on 29 July 1955, resulting in the death of one crew member and one passenger. Prior to that, she had a long career under a number of different names.
United States