Dawn treading: KC-135 takeoffs and landings at dawn
A KC-135 Stratotanker flies over the flightline as it prepares to circle and land at Transit Center at Manas, Kyrgyzstan, August 22, 2013. The KC-135 aircraft is made of more than 50 percent aluminum by weight, and 10 percent steel and stainless steel, among other materials. (U.S. Air Force photo/Staff Sgt. Robert Barnett)