First Lieutenant Frank Seifert (holding hose) and lst Lt. Virgil Hine in De Havilland DH-4 plane that was used during refueling flight of June 27 1923.
United States Air Force
1923
Maurer Maurer, 1987, Aviation in the US. Army, 1919-1938, United States Air Force Historical Research Center, Office of Air Force History,  United States Air Force, Washington, D.C.