A B-1B Lancer assigned to the 34th Bomber Squadron, Ellsworth Air Force Base, S.D., rests on the flightline as pilots perform preflight checks during Red Flag 17-1 on Nellis Air Force Base, Nev., Jan. 25, 2017. Red Flag night missions present the additional challenge of low visibility, testing aircrew’s ability to execute the mission at any hour in a contested and degraded environment. (U.S. Air Force photo by Airman 1st Class Kevin Tanenbaum/Released)