Senior Airman David Ching, 28th Aircraft Maintenance Squadron aircraft systems journeyman, prepares to inspect the fuel system on a B-1B at Ellsworth Air Force Base, S.D., March 8, 2012. The B-1’s fuel systems are routinely checked and maintained to ensure any possible leaks or malfunctions are repaired. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)