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 Lyndonia (SP-734), later known as USS Vega (SP-734) was a yacht acquired by the U.S. Navy during World War I. She was assigned as an armed patrol craft, but, at times, performed other duties along the U.S. East Coast, such as dispatch boat and training ship for the U.S. Naval Academy. Post-war, she was disposed of through sale to the public.
USS Arcturus (SP-182) was a yacht acquired by the U.S. Navy during World War I. She was reconfigured by the Navy as an armed patrol craft, and was assigned to patrol the waterways of New York City.
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.
The fifth USS Despatch (SP-68), later PY-8, originally USS Vixen (SP-68), was a yacht that served in the United States Navy as a tender from 1917 to 1919 and from 1920 to 1921.
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.
USS Hoqua (SP-142) was an armed yacht that served in the United States Navy as a patrol vessel from 1917 to 1919.
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.
USS Navajo III (SP-298), later USS SP-298, was an armed motorboat that served in the United States Navy as a patrol vessel from 1917 to 1919.
The wooden-hulled, twin-screw, steam yacht Akela—built in 1899 at Morris Heights, N.Y., by the Gas Engine and Power Co. and the Charles L. Seabury Co.—was acquired by the Navy from Bridgeport, Connecticut businessman Henry Alfred Bishop and delivered on 24 December 1917. Redesignated USS Akela (SP-1793) was commissioned at the New York Navy Yard on 16 April 1918.
USS Cigarette (SP-1234) was a patrol vessel that served in the United States Navy from 1917 to 1919.
USS Mary Alice (SP-397) was a United States Navy patrol vessel commissioned in 1917 and sunk in 1918.
USS Vergana (SP-519), later OYP-519, was a United States Navy patrol vessel in commission from 1917 to 1919.
USS Wild Goose (SP-562) was a United States Navy patrol vessel in commission from 1917 to 1920.
USS Vivace (SP-583) was a United States Navy patrol vessel in commission from 1917 to 1918.
The second USS Calumet (SP-723) was a United States Navy patrol vessel in commission from 1917 to 1919.
USS Sister (SP-822) was a United States Navy tug in commission from 1917 to 1919.
USS Onward (SP-311), a former yacht named Galatea and then Ungava was a patrol yacht acquired by the U.S. Navy during World War I. She was transferred to the U.S. Coast and Geodetic Survey where she served briefly until return to the Navy for a brief time before her disposal by sale. She was renamed Thelma Phoebe.
United States