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Afghan air force Lt. Mohammad Hamayoon, a laboratory fuels specialist, watches Master Sgt. Jeremiah Fentress, a fuels advisor with the 439th Air Expeditionary Advisory Squadron, mix a fuel sample during a basic fuels laboratory analysis training class at Kabul International Airport, March 5, 2012. In addition to analyzing fuels samples, students received specialized training needed to properly perform an American Petroleum Institute (API) density test, Fuels System Icing Inhibitor (FSII) test, Conductivity Unit (CU) test and an inline sample test. (U.S. Air Force photo by Staff Sgt. Nadine Y. Barclay)
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