Charles Justiz is a pilot, corporate aviation safety consultant and the author of Specific Impulse. A graduate of the United States Air Force Academy and a former officer of the United States Air Force, Justiz spent tours of duty as an instructor pilot at Webb Air Force Base as well as doing flight test at Eglin Air Force Base. Retired from NASA as of June 1, 2010, he was rated as both an instructor pilot and an examiner pilot in the Astronaut T-38, the Shuttle Training Aircraft (with more than 25 years of experience and 15,000+ Shuttle approaches), the C-9 and in the 747 Shuttle Carrier.