Senior Airman Mark Miller, 628th Logistics Readiness Squadron Fuels Laboratory technician, checks a jar of Jet fuel from an R-11 Truck for water and sediments May 9, 2013, at Joint Base Charleston – Air Base, S.C. Since fuel is lighter than water the two separate during this test while sediments gather in the middle. (U.S. Air Force photo/Senior Airman Dennis Sloan)