This 1930s photograph shows a U.S. Army Air Corps pursuit biplane of the Curtiss Hawk family, likely photographed for aerodynamic research by the National Advisory Committee for Aeronautics (NACA), the predecessor to NASA. Aircraft such as this represented the last generation of open-cockpit, fixed-gear fighter biplanes before the U.S. military transitioned to all-metal monoplane fighters in the late 1930s. Project: 218463