USS Seatag
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(MB: 1. 51'; b. 10'3''; dr. 2'5"; s. 22 mph.; cpl. 10; a.
1 1-pdr.)

Seatag was built in 1917 by the Great Lakes Boatbuilding Corporation, Milwaukee, Wis., acquired by the Navy from Donald Ryerson of Chicago by a free lease on 9 July 1917, and placed in commission on 1 August 1917, Ens. Sylvester Aparling, USNRF, in command.

During World War I, Seatag (SP-506) was based on the Great Lakes. She served primarily on the Detroit and St. Clair River Patrols until 4 October 1918. On 18 November, Seatag was placed out of commission and was returned to her owner on 7 March 1919.