Assigned to the 5th Naval District and based at Norfolk, George H. Bradley performed local patrol duties in the Norfolk area until 19 March 1918. She then was fitted with minesweeping gear and took on patrol and minesweeping duties between Cape Henry, Virginia, and Sea Basque. On 13 June 1918 she joined the minesweeping squadron in the Chesapeake Bay and swept the waters from Norfolk Gate to Baltimore Gate for the rest of World War I.
George J. Bradley was stricken from the Navy List on 6 May 1919 and sold back to Captain Humphries the same day.