Photograph of a California National Guard Douglas O-38 aircraft in flight, circa 1930s. The man in the rear cockpit is standing up and waving at the camera.
Photograph of Lieutenant Wallen piloting a U.S. Army Air Corps Douglas O-38 aircraft, circa 1930s. The "dagger and ace of spades" emblem of the 116th Observation Squadron is painted on the fuselage.Caption: "116 Obs Sqdn / H.D. 10 (7-10-35 pm) / Lt.…