Blake Stamps, University of Oklahoma student, inspects a contaminant from a bio fuel tank on Barksdale Air Force Base, La., April 2, 2014. The Air Force Research Lab at Wright-Patterson Air Force Base, Ohio, teamed with Dr. Bradley Stevenson&apos;s laboratory at the University of Oklahoma and conducted surveys of storage tanks at various bases around the country and determined what types of microorganisms existed and how to control them. (U.S. Air Force photo/Staff Sgt. Jason McCasland)