Reverse reads: "Miami River Parkway --Filling and grading Old Mc.Cook Field,Dayton.Ohio." McCook Field was an airfield and aviation experimentation station operated by the Aviation Section, U.S. Signal Corps and its successor, the United States Army Air Service from 1917-1927. The field was located approximately one mile (1.6 km) north from downtown Dayton, Ohio. Constructed during World War I, it became the location of the Aviation Service's Engineering Division in 1919. Urban growth encroached on the space and larger aircraft being developed overtaxed the field's surface. Ultimately, the field became too small for its purpose. The Army intended to relocate McCook's operations to Langley Field, Virginia, but Dayton's civic leaders did not...