Airman 1st Class Jaylin King an aerospace propulsion apprentice assigned to the 28th Aircraft Maintenance Squadron, Ellsworth Air Force Base, S.D., works on a B-1B Lancer during Red Flag 17-1 on Nellis Air Force Base, Nev., Jan. 27, 2017. Aerospace Propulsion specialists test, maintain and repair all parts of the engine in order to keep the B-1b flying during the three week exercise. (U.S. Air Force photo by Airman 1st Class Kevin Tanenbaum/Released)