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U.S. Air Force Tech Sgt. Kristen Nickerson, left, 423d Medical Squadron NCO in charge of bio-environmental engineering, conducts a qualitative fit test on a N95 mask for Staff Sgt. Jennalyse Adam, 423d MDS dental assistant, at RAF Alconbury, England April 14, 2020. The 423d MDS were conducting fit tests of the N95 mask to ensure personnel are safe to continue to treat patients who may have contracted the novel coronavirus. (U.S. Air Force photo by Senior Airman Eugene Oliver)
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