Senior Airman Steven McCarthy, 22nd Logistics Readiness Squadron Petroleum, Oils and Lubricants flight fuels laboratory technician, fills a fuel container, July 14, 2015, at McConnell Air Force Base, Kan. McCarthy pulled one gallon of fuel from an R-11 fuel truck to test for particular contamination in the fuels lab. (U.S. Air Force photo by Senior Airman Victor J. Caputo)