Airman 1st Class Peter Xiong, 28th Aircraft Maintenance Squadron crew chief, discards a fuel sample after inspecting a B-1 bomber sump for debris and other contaminants at Ellsworth Air Force Base, S.D., Oct. 24, 2013. If contaminants are found during the fuel test, the fuel must be drained and eliminated to ensure a B-1’s fuel burns better and cleaner, increasing the longevity of the aircraft. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)