GRISSOM AIR RESERVE BASE, Ind. -- Airman 1st Class Michael McNally, 434th Maintenance Squadron KC-135R crew chief, tries on an M50 gas mask here Jan. 5. The 434th Mission Support Group bioenvironmental engineering team began fitting Airmen for the new masks and will continue to do so over the coming months. (U.S. Air Force photo/Senior Airman Andrew McLaughlin)
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