 "Zizania" was transferred to the U.S. Department of War by an executive order dated 24 April 1917.Subsequently reassigned to the US Navy, "Zizania" served during World War I as a tender to section patrol craft operating in the 1st Naval District.When control over the United States Lighthouse Service reverted on 1 July 1919 to the US Department of Commerce, "Zizania" was struck from the Navy List.