Robert Bills, Aerospace Fuels Lab chemist, places a sample tube in the sample tray of the inductive coupled plasma optical emission spectrometer (ICP/OES) as part of a routine job in the Investigative Analysis Lab at Wright-Patterson Air Force Base, Ohio, Feb. 13, 2018. The ICP/OES detects the presence of certain metals in a sample.

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Keywords: aerospace, air, america, analysis, armed, army, chemist, chemistry, chromatogram, defence, employee, federal, fluid, force, forces, fuels, government, hydraulic, investigative, lab, military, navy, routine, service, serviceman, servicemen, states, united, usa