sentences: "The Air Corps followed up the flight of the "Question Mark" with a mission to demonstrate its applicability in combat.On May 21, 1929, during annual maneuvers, a Keystone LB-7 piloted by Moon took off from Fairfield Air Depot in Dayton, Ohio, on a simulated mission to New York City via Washington, D.C. Plans were for the bomber to be refueled in flight several times, drop a flash bomb over New York harbor, then return to Dayton non-stop, again by way of Washington.