Airman 1st Class Michael Peek, 92nd Logistics Readiness Squadron refueling equipment operator, wrangles a pipe hookup from a pumping station to a R-11 fuel tanker truck July 26, 2016, at Fairchild Air Force Base, Wash. Vital to ensure that no contaminants make it into aircraft, fuels airmen check fuel purity regularly. (U.S. Air Force photo/ Airman 1st Class Sean Campbell)