Airman 1st Class Collin Dunn, 28th Logistic Readiness Squadron fuels laboratory technician, pours aircraft fuel into a bottle method funnel during a test in the Fuels Lab at Ellsworth Air Force Base, S.D., March 22, 2012. Random samples are periodically tested before entering aircraft, to ensure that the safest, debris-free fuel is used. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)