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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 five U.S. Army Air Corps Douglas O-38 aircraft in flight over mountainous terrain, February 6, 1931. Inscription: "(O42A-92P-115) (2-6-31) (12-4100)."

Photograph of a California National Guard Douglas O-38 aircraft (fuselage number 9) in flight, circa 1930s. Caption: "38-103."

Photograph of a California National Guard Douglas O-38 aircraft (fuselage number 9) in flight, circa 1930s. Caption: "38-104."

Photograph of a California National Guard Douglas O-38 aircraft (fuselage number 9) in flight, circa 1930s. Caption: "38-102."

Photograph of a California National Guard Douglas O-38A aircraft (fuselage number 4), circa 1930s-1940s.

Photograph of the California National Guard's "bear and sun" emblem painted on an aircraft fuselage, circa 1930s-1940s.

Photograph of a U.S. Army Air Corps Douglas O-46A aircraft (serial number 35-183), circa 1930s-1940s. The "knight and devil" emblem of the 91st Observation Squadron is painted on the fuselage.

Photograph of a Douglas T2D-1 seaplane, June 11, 1929. Several people are maneuvering the boat via its pontoons.Caption: "1254 / T2D-1 / 6-11-29 / Plane 396."

Photograph of several U.S. Army Air Corps Douglas BT-2 aircraft parked at an airfield, circa 1920s.