Staff Sgt. Joshua Free, a dedicated crew chief assigned to the 28th Aircraft Maintenance Squadron, checks the metal structure of a B-1 bomber prior to a Red Flag 16-2 night training sortie at Nellis Air Force Base, Nev., March 10, 2016. Red Flag exercises simulate a conflict environment in which maintainers must work diligently around the clock to ensure the safety and operability of their assigned aircraft. (U.S. Air Force photo by Senior Airman Joshua Kleinholz/Released)