USS May (SP-164) was a yacht purchased by the United States Navy during World War I. She was outfitted with two 3inches guns and two machine guns, and was assigned to patrol the Atlantic Ocean coast and Caribbean and to protect Allied ships from German submarines. After over two years of patrol work, she ran aground off Cape Engano on the Dominican Republic and had to be abandoned.
May — a 11000NaN0 steam yacht built in 1891 by Ailsa Shipbuilding Co., Troon, Scotland — was originally brought to the United States by E.D. Morgan III as private yacht, and later was purchased by the U.S. Navy from J. R. De Lamar on 11 August 1917; and commissioned on 7 October 1917.
Operating out of New London, Connecticut, May patrolled along the Atlantic coast and in the Caribbean during World War I, protecting vital Allied shipping from German U-boats.
As of March 1919, she was intended for eventual service as a flagship, but she ran aground on a reef off Cape Engano, Santo Domingo on 27 July 1919; after efforts to refloat her failed she was declared abandoned on 28 February 1920.
After unfruitful attempts to refloat her, Mays wreck was offered for sale. However, no purchasers appeared, and she was abandoned as unsalable in June 1923.
Ensign Tedford H. Cann, USNRF was awarded the Medal of Honor for "courageous conduct" onboard May in November 1917. His citation reads: