Senior Airman Sixto Trevino and Airman 1st Class Wilson Arocho, 5th Civil Engineer Squadron water and fuel systems maintenaners, prepare their equipment to perform maintenance on a fuel tank at Minot Air Force Base, N.D., Sept. 12, 2012. Keeping the water level down is a recurring maintenance job that keeps the fuel system running correctly. (U.S. Air Force photo/Senior Airman Brittany Y. Auld)