Staff Sgt. Justin Hollis and Senior Airman Jacob Widtmannheiser, crew chiefs assigned to the 28th Aircraft Maintenance Squadron, Ellsworth Air Force Base, S.D., talk as a B-1B Lancer prepares to takeoff during Red Flag 17-1 on Nellis Air Force Base, Nev., Jan. 27, 2017. All four branches of the U.S. military and air forces from allied nations participate in Red Flag in order to familiarize forces that will work together in future operations. (U.S. Air Force photo by Airman 1st Class Kevin Tanenbaum/Released)