Staff Sgt. Dallas English, 28th Logistics Readiness Squadron fuels laboratory NCO in charge, measures filtration time and solids content during a jet fuel sample test at Ellsworth Air Force Base, S.D., March 26, 2013. This crucial process verifies that no contaminants are in the fuel, preventing damage to the engine. (U.S. Air Force photo by Airman 1st Class Anania Tekurio/Released)