U.S. Air Force Airman 1st Class Austin Hayes, 31st Logistics Readiness Squadron petroleum oils and lubricants mobile distribution operator visually inspects fuel for color, water and sediments, Aug. 26, 2015, at Aviano Air Base, Italy. Airmen from POL check for contaminates in fuel stored in R-11 refueling trucks at the beginning of each duty day. (U.S. Air Force photo by Senior Airman Areca T. Wilson/Released)