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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.…

Photograph of two U.S. Army Air Corps Douglas O-38 aircraft in low flight over a field, circa 1930s-1940s.

Photograph of two U.S. Army Air Corps Douglas O-38 aircraft in low flight over a field, circa 1930s-1940s.

Photograph of a U.S. Army Air Corps Douglas O-38 aircraft, circa 1930s-1940s. Other aircraft are parked in the background.

Photograph of three U.S. Army Air Corps Douglas O-38 aircraft in flight, July 22, 1932. Caption: "(0199-61G-115) (7-22-32)."

Photograph of five U.S. Army Air Corps Douglas O-38 aircraft in flight over mountainous terrain, February 6, 1931. Caption: "(O37 92-P-115) (2-6-31) (12-4100)."

Photograph of five U.S. Army Air Corps Douglas O-38 aircraft in flight over mountainous terrain, February 6, 1931. Caption: "(O38 92-P-115) (2-6-31) (12-4100)."

Photograph of a U.S. Army Air Corps Douglas YO-31A aircraft, February 5, 1933.Caption: "Douglas YO31A / (G-1-92P-115) / 2-5-33."

Photograph of a U.S. Army Air Corps Curtiss P-6 Hawk aircraft, circa 1920s-1930s.

Photograph of a U.S. Army Air Corps Curtiss B-2 Condor aircraft in flight, circa 1920s.Caption: "[Cur]tiss Condor Bomber."