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Staff Sgt. Bryan Farley, 96th Aircraft Maintenance Unit Electrical and Environmental Shop, performs a breathing exercise during a gas mask fit test on Barksdale Air Force Base, La., May 9, 2013. Barksdale personnel perform a number of breathing exercises to ensure they have the correct gas mask size and that there is no break in the seal. (U.S. Air Force photo/Airman 1st Class Benjamin Gonsier)


If the seal if broken, you'll be choking

Staff Sgt. Bryan Farley, 96th Aircraft Maintenance Unit Electrical and Environmental Shop, performs a breathing exercise during a gas mask fit test on Barksdale Air Force Base, La., May 9, 2013. Barksdale personnel perform a number of breathing exercises to ensure they have the correct gas mask size and that there is no break in the seal. (U.S. Air Force photo/Airman 1st Class Benjamin Gonsier)

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