X-15 Pilot Joe WalkerNASA research pilot Joe Walker flew the X-15 rocket plane to an altitude of 271,000 feet, or 51 miles high, becoming the first civilian test pilot to exceed 50 miles altitude.Read More Facebook Pinterest X LinkedIn Email https://www.nasa.gov/image-detail/x-15-pilot-joe-walker/Copy URL to clipboard> DownloadShareSize1041x1206px