USS Milan (YP‑6) was a 75-foot patrol boat which served in the United States Coast Guard as Onondago (WCG-209) until transferred to the United States Navy. The ship was built in 1925 by Kingston Drydock and Construction Company of Kingston, New York.
USS YP-422 was a United States Navy yard patrol (YP) boat that served the United States Navy in World War II from 1942 to 1943. Built in 1941 as the fishing trawler Mist, she was acquired by the US Navy in June 1942 and was converted for naval use by George Lawley & Son of Neponset, Massachusetts. She was commissioned on 28 July 1942 and was put into service to patrol the waters around the Boston Navy Yard. The vessel was lightly armed with a 3-inch gun and two .30 caliber machine guns.
USS Zumbrota (SP-93/YP-93) was a motor boat in the United States Navy.
USS Edithena was a United States Navy patrol vessel in commission from 1917 to 1919 that saw service during World War I. Prior to her U.S. Navy service, she operated as the private motor yacht Edithena from 1914 to 1917. After the conclusion World War I, she served as the fishery patrol vessel USFS Widgeon in the fleet of the United States Bureau of Fisheries from 1919 to 1940 and as US FWS Widgeon in the fleet of the Fish and Wildlife Service from 1940 to 1942. During World War II, she returned to U.S. Navy service from 1942 to 1944 as the yard patrol boat USS YP-200. By 1947 she had returned to private ownership, first as Edithena and during the 1970s and 1980s as the fishing vessel Ila Mae.
USS Flamingo (AM-32) was a Lapwing-class minesweeper built for the United States Navy near the end of World War I. After service overseas clearing mines after the Armistice, the ship was laid up until 1922 when she was transferred to the United States Department of Commerce for use by the United States Coast and Geodetic Survey. Renamed USC&GS Guide, the ship operated as a survey vessel along the West Coast of the United States for 17 years, making significant contributions to navigation, hydrographic surveying, and oceanography. In June 1941, Guide was transferred back to the Navy, converted into a salvage ship, and renamed USS Viking (ARS-1). As Viking, she worked primarily from bases in California until 1953, when she was sold for scrapping.
The third USS Relief (YP-2) was a lookout station tender that served in the United States Navy from 1917 to 1921.
USS De Grasse (ID-1217) was the projected name for an armed yacht that the United States Navy acquired for service as a patrol vessel in 1918 but, according to some sources, never commissioned, although other sources claim she saw brief naval service in 1918. In World War II, she was reacquired and served as YP-506. The yacht's official number was registered under the name Fleet as of 1959, fate unknown.
USS Eaglet (SP-909), later redesignated YP-909, was an armed motorboat that served in the United States Navy as a patrol vessel from 1917 to 1921.
USS Maple, was a lighthouse tender that served in the United States Navy from 1893 to 1899, seeing service as an auxiliary ship during the Spanish–American War in 1898, and from 1917 to 1919, operating as a patrol vessel during World War I. She also served as USLHT Maple in the United States Lighthouse Board fleet from 1899 to 1910 and in the United States Lighthouse Service from 1910 to 1933.
USS Privateer (SP-179), later YP-179, was an armed motorboat that served in the United States Navy as a patrol vessel from 1917 to 1930.
USS Helori (SP-181), later YP-181, was an armed motorboat that served in the United States Navy as a patrol vessel from 1917 to 1922.
USS Clarinda (SP-185), later YP-185, was an armed yacht that served in the United States Navy as a patrol vessel from 1917 to 1930.
The first USS Josephine (SP-913), later USS SP-913, was a United States Navy patrol vessel in commission from 1917 to 1918.
USS Raeo (SP-588) was a United States Navy patrol vessel in commission from 1917 to 1919. Prior to her U.S. Navy service, she operated as the motor passenger vessel Raeo from 1908 to 1917. After the conclusion of her U.S. Navy career, she served as the fishery patrol vessel USFS Kittiwake in the United States Bureau of Fisheries fleet from 1919 to 1940 and as US FWS Kittiwake in the Fish and Wildlife Service fleet from 1940 to 1942 and from 1944 to at least 1945, and perhaps as late as 1948. During World War II, she again served in the U.S. Navy, this time as the yard patrol boat USS YP-199. She was the civilian fishing vessel Raeo from 1948 to 1957, then operated in various roles as Harbor Queen from 1957 to 1997. She became Entiat Princess in 1998 and as of 2009 was still in service.
USS Constance II (SP-633), later USS YP-633, was a United States Navy patrol vessel in commission from 1917 to 1922.
USS Herreshoff No. 322 (SP-2373), also written Herreshoff #322, was a United States Navy patrol vessel in commission from 1918 to 1919.
USS Sanda, later USS YP-3 was a United States Navy patrol vessel in commission from 1917 to 1920 which later served New York City for over 20 years.
USS Sylph (PY-12), briefly YP-71, was a yacht in commission in the United States Navy as a patrol yacht from 1940 to 1946.
USS YP-17 was a wooden-hulled patrol vessel in commission in the fleet of the United States Coast Guard as CG-275 from 1925 to 1933, and in the fleet of the United States Navy as YP-17 from 1933 until 1941. She was captured by Japanese forces during the Japanese attack on Guam.
USS YP-10 was a wooden-hulled patrol vessel in commission in the fleet of the United States Coast Guard as CG-194 from 1925 to 1934, and in the fleet of the United States Navy as YP-10 from 1934 until 1941.
United States