Robert Bills, Aerospace Fuels Lab chemist, places a sample of hydraulic fluid from an F-22 Raptor in a gas chromatogram as part of a routine analysis in the Investigative Analysis Lab at Wright-Patterson Air Force Base, Ohio, Feb. 13, 2018. Bills receives samples from flight-line maintainers to look for contaminates.

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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