Senior Airman Joel Mitchell, 2nd Logistics Readiness Squadron, checks an R-12 hydrant truck for any abnormalities on Barksdale Air Force Base, La., Dec. 10. The hydrant truck acts as a portable pump, moving fuel between the aircraft and the fuel storage tanks below the flightline, filtering it during the process. This process is much faster than using tanker trucks to refuel aircraft. (U.S. Air Force photo/Airman 1st Class Benjamin Gonsier)