Maj. Frank Welton, 28th Operations Support Squadron assistant director of operations, checks controls during a hot pit refueling procedure on a B-1 bomber at Ellsworth Air Force Base, S.D., Feb. 12, 2013. Hot pit refueling is a carefully controlled process performed while engines are running, resulting in faster aircraft regeneration. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)