Pictured is the crew of the "Question Mark," including, from left to right, Lieutenant Harry Halvorsen, Capt. Ira Eaker, Staff Sgt. Roy Hooe, Maj. Carl Spaatz (mission commander), Lt. Elwood "Pete" Quesada, and an unidentified crewmember. During a 1929 refueling operation dubbed "Question Mark," a Fokker C-2A was refueled in flight by two modified Douglas C-1 transport aircraft. (Courtesy photo)
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