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Tech. Sgt. Margaret, bioenvironmental engineering NCO in-charge, administers a qualitative mask fit test using a hood and collar assembly at an undisclosed location in Southwest Asia Dec. 24, 2014. Collins was fit testing personnel on a mask called the 3M N95 particulate respirator. Margaret is currently deployed from Nellis Air Force Base, Nev., and is a native of Chicago, Ill. (U.S. Air Force photo/Tech. Sgt. Marie Brown)
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