The second USS Conestoga (SP-1128/AT-54) was an ocean-going tug in the United States Navy. Commissioned in 1917, it disappeared in the Pacific Ocean in 1921. The fate of the vessel was a mystery until its wreck was positively identified in 2016.
USS Sea Hawk (SP-2365) was an armed motorboat that served in the United States Navy as a patrol vessel from 1917 to 1919.
USS Genesee (AT-55), formerly Monocacy, was a fleet tug in the U.S. Navy in World War I and World War II built in 1905. She was scuttled on 5 May 1942 at Corregidor to avoid capture. Nevertheless, she was raised by the Japanese and designated as Patrol Boat No. 107. She was sunk by American planes on 5 November 1944.
USS Penobscot (SP-982/YT-42/YTB-42) was a commercial harbor tugboat purchased by the U.S. Navy at the start of World War I. Penobscot performed her towing services for the 5th Naval District on the U.S. East Coast, and continued to do so for the 3rd Naval District through the end of World War II. She was finally retired from Navy service in 1947.
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 War Bug (SP-1795) was a three-armed motorboat in commission in the United States Navy as a patrol vessel from 1917 to 1918.
The first USS Courtney (SP-375) was a patrol boat and minesweeper in commission in the United States Navy from 1917–1919.
USS Patrol No. 1 (SP-45), often rendered as USS Patrol #1, was an armed motorboat that served in the United States Navy as a patrol vessel from 1917 to 1919.
USS Goliah (SP-1494), also listed as ID-1494, was an armed tug that served in the United States Navy as a patrol vessel and tug from 1918 to 1919.
The first USS Kangaroo (SP-1284) was an armed motorboat that served in the United States Navy as a patrol vessel from 1917 to 1919.
USS Calabash (SP-108) was a civilian motor yacht that served in the 7th Naval District as an armed patrol boat in the United States Navy during July and August 1917. Apparently found unsuitable for naval service, Calabash served for less than a month before being decommissioned and returned to her owner in August 1917.
USS Nepenthe (SP-112) was a luxury yacht belonging to James Deering and used at his estate, Vizcaya in Miami, Florida. The yacht was completed December 1916 and delivered to Deering who immediately took the yacht to Florida. Nepenthe was acquired by the United States Navy, designated a house boat though given the S.P. indicator of a section patrol vessel, and used briefly from 7 June to 5 October 1917. The yacht resumed its place at the estate until it sank in 1926 during a major hurricane one year after Deering's death. After salvage the yacht was sold.
The second USS Cossack (SP-695) was an armed motorboat that served in the United States Navy as a patrol vessel from 1917 to 1919.
The first USS Albacore (SP-751) was a United States Navy patrol vessel in commission from 1917 to 1919.
USS Fli-Hawk (SP-550) was a United States Navy patrol vessel in commission from 1917 to 1919.
USS Katie (SP-660) was a United States Navy patrol vessel in commission from 1917 to 1918.
USS Normannia (SP-756) was a United States Navy patrol vessel in commission from 1917 to 1918.
USS Rosa (SP-757) was a United States Navy patrol vessel in commission from 1917 to 1918.
The first USS Elizabeth (SP-972) was a United States Navy patrol vessel in service from 1917 to 1919.
The second USS Elizabeth (SP-1092) was a United States Navy patrol vessel in commission from 1917 to 1918.
