Checking the fluids
U.S. Air Force Airman 1st Class Jacob Brathall, 23d Logistics Readiness Squadron petroleum, oil and lubricants flight fuel distribution operator, inspects fuel for contaminates Aug. 1, 2014, at Moody Air Force Base, Ga. The visible scan is one method to ensure that fuel delivered to aircraft is clean and ready for use. (U.S. Air Force photo by Staff Sgt. Eric Summers Jr./Released)