Airman 1st Class Nicholas Clendenen, 100th Logistics Readiness Squadron preventative maintenance technician from Colorado Springs, Colo., prepares to drain the tank of an R-11 refueling truck June 26, 2013, on RAF Mildenhall, England, so that it's light enough to undergo maintenance. Maintaining the R-11 refueling trucks is essential to keeping up the flow of Jet Propulsion grade 8 fuel to aircraft and equipment. (U.S. Air Force photo by Airman 1st Class Preston Webb/Released)