U.S. Air Force Senior Airman Miranda Wolverton, 100th Logistics Readiness Squadron Fuels laboratory technician from Parsons, Kan., measures a fuel sample Feb. 11, 2014, on RAF Mildenhall, England. Technicians must mix exact amounts of fuel and water to test the Fuels System Icing Inhibitor. Performing the FSII test confirms the fuel won’t freeze when aircraft reach high altitudes. (U.S. Air Force photo by Airman 1st Class Preston Webb/Released)