Airman 1st Class Ryan Harris, 28th Logistics Readiness Squadron refueling maintenance technician, replaces a tank level override button on a fuel truck during maintenance at Ellsworth Air Force Base, S.D., March 8, 2012. The override button allows personnel to bypass the automatic shutoff probe called the high-high probe if the fuel truck is full. (U.S. Air Force photo by Airman Alystria Maurer/Released)