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Photographic group portrait of the 9th Observation Group, U.S. Army Air Service, circa 1920s-1930s. Caption: "(G722-876F-14) / 9th Observation Group."

Photograph of a Douglas C-1 aircraft (fuselage number 1) aerially refueling the "Question Mark," a U.S. Army Air Service Fokker C-2A aircraft, circa 1929.

Photograph of an aerial refueling procedure between a Douglas C-1 aircraft and the "Question Mark," a U.S. Army Air Service Fokker C-2A aircraft, circa 1929.

Photograph of a Douglas C-1 aircraft (fuselage number 1) aerially refueling the "Question Mark," a U.S. Army Air Service Fokker C-2A aircraft, circa 1929.

Photograph of a U.S. Army Air Service Northrop A-17A aircraft, circa 1937.

Photograph of a U.S. Army Air Service Curtiss P-6 Hawk aircraft (fuselage number 22), circa 1930. Inscription on verso: "U.S. Army pursuit biplane / circa 1930."

Photograph of Frank Luke with a downed aircraft, circa 1918.

Photograph of Frank Luke (foreground) and other servicemen posing with a machine gun, circa 1917-1918.

Photograph of a U.S. Army Air Service LePère C II aircraft (tail number SC-42129), circa 1918.

Photograph of a captured Fokker D.VII aircraft (fuselage number U.10), circa 1918. The 95th Aero Squadron's "kicking mule" emblem is painted on the fuselage.