On August 25, 1954, while testing the fifth production F-86H (serial number 52-1981), at Edwards Air Force Base, Joseph C. McConnell, Jr. was killed in a crash following a control malfunction. The crash's cause was attributed to a missing bolt. Then Major Chuck Yeager was assigned to investigate the crash and replicated the malfunction at a much higher altitude, recovering before he hit the desert floor. The end of this movie had to be changed to reflect this event.