Senior Airman Steven McCarthy, 22nd Logistics Readiness Squadron Petroleum, Oils and Lubricants flight fuels laboratory technician, seals a water detection pad package for testing back in the fuels lab, July 14, 2015, at McConnell Air Force Base, Kan. The pad checks for water contamination in the fuel. If the water molecules freeze during flight at high altitude, dangerous malfunctions are more likely to occur. (U.S. Air Force photo by Senior Airman Victor J. Caputo)