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Staff Sgt. Shawn Gallagher, 2nd Aerospace Medical Squadron, annotates the readings off a photocount plus machine on Barksdale Air Force Base, La., May 9, 2013. During a gas mask fit test, a photocount plus machine measures the particle readings from the air in the room and compares it to the air found in the gas masks to ensure the masks are sealed properly. (U.S. Air Force photo/Airman 1st Class Benjamin Gonsier)


If the seal if broken, you'll be choking

Staff Sgt. Shawn Gallagher, 2nd Aerospace Medical Squadron, annotates the readings off a photocount plus machine on Barksdale Air Force Base, La., May 9, 2013. During a gas mask fit test, a photocount plus machine measures the particle readings from the air in the room and compares it to the air found in the gas masks to ensure the masks are sealed properly. (U.S. Air Force photo/Airman 1st Class Benjamin Gonsier)

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