U.S. Air Force Staff Sgt. Ian Ivey, 27th Aircraft Maintenance Unit dedicated crew chief, performs a pre-flight inspection of an F-22A Raptor at Joint Base Langley-Eustis, Virginia, Feb. 14, 2018. Pre-flight inspections are performed by crew chiefs to ensure there is no existing damage from previous flights. (U.S. Air Force photo by Senior Airman Derek Seifert)