A KC-135 Stratotanker refuels a B-52 Stratofortress, July 31, 2016. Polar Roar included three non-stop, simultaneous strategic bomber routes. The B-52s and B-2 Spirits demonstrated the ability to provide a flexible and vigilant long-range global-strike capability. (U.S. Air Force photo/Airman 1st Class Christopher Thornbury)