Senior Airman Jacob Widtmannheiser, a crew chief assigned to the 28th Aircraft Maintenance Squadron, Ellsworth Air Force Base, S.D., prepares a B-1B Lancer for take-off during Red Flag 17-1 on Nellis Air Force Base, Nev., Jan. 27, 2017. Red Flag is one of a series of advanced training programs administered by the U.S. Air Force Warfare Center to train aircrews. (U.S. Air Force photo by Airman 1st Class Kevin Tanenbaum/Released)