Fuel testing keeps planes in the fight
U.S. Air Force Staff Sgt. Joseph Guzman, 455th Expeditionary Logistics Readiness Squadron Fuels Laboratory noncommissioned officer in charge, conducts a fuel sample analysis at Bagram Air Field, Afghanistan, May 16, 2015. Guzman ensures the fuel delivered to aircraft at Bagram meets the Air Force standard. (U.S. Air Force photo by Tech Sgt. Joseph Swafford/Released)