Dr Sam M. Burka (left), a physicist at McCook Field, Ohio and Lt. George W. Goddard prepare for photographing of solar eclipse 24 January 1925 by the United States Army Air Service
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.