Foggy take-off
A KC-135 Stratotanker assigned to the 931st Air Refueling Group taxis down the flightline before take-off, McConnell Air Force Base. Kan., Dec. 4, 2014. The KC-135 serves as the core of the Air Force’s air refueling fleet and has performed this role for more than 50 years. (U.S. Air Force photo by Senior Master Sgt. Ray Lewis)