Senior Airman Steven McCarthy, 22nd Logistics Readiness Squadron Petroleum, Oils and Lubricants flight fuels laboratory technician, clears the remaining fuel out of a tube after drawing a gallon of fuel from a R-11 fuel truck for testing, July 14, 2015, at McConnell Air Force Base, Kan. McCarthy tests the fuel from an average of four trucks a week, where he will use one quart for a visual sample and one gallon to test back in the fuels laboratory. (U.S. Air Force photo by Senior Airman Victor J. Caputo)