POL: Who's got fuel?
SEYMOUR JOHNSON AIR FORCE BASE, N.C.- Senior Airman William Thomas adds fuel to water during a fuel system icing inhibitor (FSII) test here Aug. 1, 2011. The FSII test determines the concentration of diethylene glycol monomethyl ether in jet fuel by refractive index. The test determines the concentration of FSII to ensure effective protection against the detrimental effect of free water. Thomas, 4th Logistics Readiness Squadron fuel lab technician, is a native of Parkersburg, W.Va. (U.S. Air Force photo by Senior Airman Whitney Lambert/ Released)