HOLLOMAN AIR FORCE BASE, N.M. -- Senior Airman Ashlee Simmons, 49th Logistics Readiness Squadron, looks through a refractometer Feb. 13. The refractometer determines the fuel systems icing inhibitor levels that let technicians know the freezing point of jet fuels which allows for higher altitude flights. (U.S. Air Force photo by Airman 1st Class Michael Shoemaker/Released)
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