A handful, mostly United States Army Air Service aviators, were decorated three or more times. Captain Eddie Rickenbacker, the top U.S. ace of the war, was awarded a record eight Distinguished Service Crosses, one of which was later upgraded to the Medal of Honor, while flying with the 94th Aero Squadron. Fellow aviators Captain Douglas Campbell, also of the 94th, and First Lieutenant Frank O'Driscoll "Monk" Hunter of the 103rd Aero Squadron each received five. Another 94th aviator, Major Reed McKinley Chambers, was awarded four Distinguished Service Crosses. Three aviators received three Distinguished Service Crosses First Lieutenant Murray K. Guthrie of the 13th Aero Squadron, First Lieutenant Ralph A. O'Neill of the 147th Aero Squadron, and Glen A. Preston, an aerial observation pilot with the 99th Aero Squadron. Among other prominent aviators were Brigadier General Billy Mitchell, the Chief of Air Service of the American Expeditionary Force; Second Lieutenant Frank Luke of the 27th Aero Squadron, who was honored with the Medal of Honor and two Distinguished Service Crosses; and Sumner Sewall of the 95th Aero Squadron, recipient of two Distinguished Service Crosses, who served as Governor of Maine from 1941 to 1945. Edward Peck Curtis, also of the 95th Aero Squadron received the Distinguished Service Cross as a First Lieutenant.