Staff Sgt. Andrew Martin, 944th Aircraft Maintenance Squadron crew chief, inspects the exterior of an F-35 Jan. 29, 2019, Luke Air Force Base, Ariz. Martin is an Air Reserve Technician working out of the 61st Aircraft Maintenance Unit. On the civilian side, he is a certified flight instructor with more than 600 total flying hours. (U.S. Air Force photo by Staff Sgt. Lausanne Kinder/RELEASED)