USS Hippocampus
USS Hippocampus was a yacht leased by the U.S. Navy during World War I. She was used as a patrol boat along the New England coast.
Hippocampus, a gasoline-powered yacht, was built by New York Yacht, Launch, & Engine Co. in 1912–1913 and was leased by the Navy from her owner, James F. Porter, of Chicago, Illinois, 21 June 1917. She was commissioned 25 June at Rockland, Maine.
Assigned to the 1st Naval District, Hippocampus served as a harbor patrol craft at the harbor entrance, Rockland, Maine, and in Penobscot Bay during World War I.
Post-war Hippocampus was decommissioned 30 November 1918 and returned to her owner 5 April 1919, who was paid $1847.85 for the use of his vessel.