The log book of retired Air National Guard Chief Warrant Officer 2 Robert Hertel is looked at during the Heritage Flight Training and Certification Course at Davis-Monthan Air Force Base, Ariz., Feb. 28, 2015. The book showed the 92-year-old veteran's, flights over Iwo Jima, Japan during World War II. (U.S. Air Force photo by Senior Airman Jensen Stidham/Released)