Airman 1st Class Peter Xiong (left) and Senior Airman Randall Sumser, 28th Aircraft Maintenance Squadron crew chiefs, examine fuel from a B-1 bomber at Ellsworth Air Force Base, S.D., Oct. 24, 2013. Sumser trained Xiong on how to perform the inspection to determine if there was anything wrong with the fuel sample. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)