Lt Col Rutherford Hartz stands in front of Round The World Martin GMB Bomber.   On July 24, 1919 Hartz took off from Bolling Field on a flight around the United States, the "Round The Rim" flight.
United States Air Force
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.