Senior Airman Austin Shrewsbury, 88th Diagnostics and Therapeutic Squadron medical laboratory technician, performs a Gram stain to a slide inside the microbiology laboratory at Wright-Patterson Air Force Base medical center June 30, 2017. Gram staining is a method of staining bacteria to make it more visible and differentiable under a microscope.

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Keywords: air, america, archive, armed, army, defence, force, forces, military, navy, reportage, service, serviceman, servicemen, soldier, states, united, usa