If the seal if broken, you'll be choking
Senior Airman Alexander Phillips, 2nd Maintenance Squadron, dons an M-50 Joint Service General Purpose Mask on Barksdale Air Force Base, La., May 9, 2013. Gas mask fit tests, which are held every Thursday from 8 to 11 a.m. at Bio-Environmental Engineering, ensure Barksdale Airmen have the correct gas mask size to protect them from chemical and biological warfare agents. (U.S. Air Force photo/Airman 1st Class Benjamin Gonsier)
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