Air Force Senior Airman Coleman Kepner, 20th Logistics Readiness Squadron fuels lab technician, looks through a refractometer at Shaw Air Force Base, , Nov. 9, 2016. The refractometer was used to inspect Jet A fuel for fuels system icing inhibitor, which prevents water in the fuel from freezing at high altitudes.

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Photo credit: © Apple White / Alamy / Afripics
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Keywords: #fuels, #lrs, #usaf, #win, archive, armed, defence, fight, forces, military, reportage, servicemen, usa