Staff Sgt. Lewis Carter, 99th Medical Group bioenvironmental engineer craftsman, uses a TVA1000B Toxic Vapor Analyzer to quantify the amount of harmful vapors in the air during a simulated chemical spill Feb. 28, 2013 at Nellis Air Force Base, Nev. In this scenario, Carter had to measure and record the amount of hydrogen sulfide gas created from a semi-truck colliding with a train. (U.S. Air Force photo by Staff Sgt. William P. Coleman)
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