Air Force Staff Sgt. Kaylee Herring, 355th Equipment Maintenance Squadron non-destructive inspection craftsman, places an oil sample in an elemental analyzer at Davis-Monthan Air Force Base, Ariz., Feb. 22, 2018. When a jet lands after its first flight, an oil sample is taken to NDI to be inspected for engine degradation.

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Keywords: -, 355th, air, america, armed, army, defence, employee, federal, fighter, force, forces, government, military, navy, ndi, service, serviceman, servicemen, states, united, usa, wing