U.S. Air Force Staff Sgt. Benny Cruz, the noncommissioned officer in charge of the 8th Logistics Readiness Squadron's fuels laboratory, checks a fuel sample for water at Kunsan Air Base, Republic of Korea, Sept. 4, 2012. Contaminants and water are some of the things fuel is tested for prior to being issued out. (U.S. Air Force photo by Senior Airman Brigitte N. Brantley/Released)