U.S. Army Air Service Second Lieutenant Erwin R. Bleckley in observer’s seat of DH-4
U.S. Army Air Service Second Lieutenant Erwin R. Bleckley, 50th Aero Squadron, in observer’s seat of DH-4, circa 1918 (U.S. Air Force)

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Photo by: U.S. Air Force |  VIRIN: 160909-F-IO108-009.JPG