Robert Bills, Aerospace Fuels Lab chemist, views a spectrum after running a sample through an infrared spectrometer in the Investigative Analysis Lab at Wright-Patterson Air Force Base, Ohio, Feb. 13, 2018. Bills reviews the spectrum for clues about the compound’s makeup.

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