Staff Sgt. Joshua Free, a Dedicated Crew Chief assigned to the 28th Aircraft Maintenance Squadron, monitors pre-flight checks on a B-1 bomber prior to a Red Flag 16-2 training sortie at Nellis Air Force Base, Nev., March 3, 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)