Staff Sgt. Malinda Schoolfield , 39th Medical Operations Squadron dental assistant, inspects a control vial in an Attest Auto Reader to ensure the machine is working properly Jan. 16, 2013, at Incirlik Air Base, Turkey. The control is always set to positive so the machine knows the difference between a positive and negative result when determining if germ spores have been eliminated. (U.S. Air Force photo by Senior Airman Anthony Sanchelli/Released)
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