(MB: t. 6; l. 50'; b. 9'; dr. 2'; s. 27.7 k.; cpl. 6; a. 1 1-pdr., 2 mg.)
Shadow III (S. P. 102), a motorboat built in 1916 by Purdy Boat Co., Miami Beach, Fla., was purchased on 12 June 1917 from her builders and commissioned on 4 September 1917, Ens. Charles D. Mack, USNRF, in command.
Shadow III patrolled the Florida coast off Miami during World War I; and, after the war, acted as an aircraft crash boat for the Naval Air Station at Miami. She was decommissioned at Miami on 25 January 1919 and was delivered to the Marine Corps Base at Parris Island, S.C., on 1 August for further service. Shadow III was taken to the Charleston (S.C.) Navy Yard in December 1919 for survey and was sold on 5 August 1921 to Mike Letiff of Charleston, S.C.