GRISSOM AIR RESERVE BASE, Ind., -- Jackie Mantravadi, chief of bioenvironmental engineering, administers a recurring mask fit test to Senior Airman Josh Minnick, survival equipment specialist with the 434th Maintenance Squadron. Mask fit retests are ongoing requirements due every 20 to 40 months. The retests are not a one time deal. (U.S. Air Force photo/Senior Airman Chris Bolen)
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