Dr. Mica Endsley (left), the U.S. Air Force Chief Scientist, visits the Arnold Engineering Development Complex during the 63rd anniversary of the complex. She toured one-of-a-kind aerospace testing facilities and spoke with Wayne Hawkins, the AEDC Propulsion Wind Tunnel Test Branch Technical Director, about the hypersonic wind tunnel test capabilities of the von Kármán Gas Dynamics Test Facility. Endsley also toured the AEDC Aerodynamic and Propulsion Test Unit for testing high speed propulsion systems and materials and the Propulsion Wind Tunnel 16-foot Supersonic Wind Tunnel, an aerodynamic testing facility. (U.S. Air Force photo/Jacqueline Cowan)