A 39th Air Base Wing dependent looks through a refractometer during the 2015 Job Shadow Day April 24, 2015, at Incirlik AB, Turkey. The refractometer is used to look for debris in the fuels sample taken from one of the 39th Logistics Readiness Squadron’s fuels truck. (U.S. Air Force photo by Airman 1st Class Cory W. Bush/Released)