U.S. Air Force Lt. Col. Robin T. Sandifer, 47th Fighter Squadron A-10 Thunderbolt II instructor pilot, lands an A-10 at Davis-Monthan Air Force Base, Ariz., Sept. 21, 2018. Over the course of 29 years, Sandifer reached the milestone of 5,000 flight hours. (U.S. Air Force photo by Airman Frankie D. Moore)