Senior Airman Nickolauss Guier, a 386th Expeditionary Logistics Readiness Squadron fuels laboratory technician, performs a Fuel System Icing Inhibitor test at an undisclosed location in Southwest Asia, Dec. 1, 2015. The FSII test is used to measure the concentration of FSII added or present in a jet fuel sample. (U.S. Air Force photo by Staff Sgt. Jerilyn Quintanilla)
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