Airman 1st Class Zachary Piper, 28th Medical Operations Squadron bioenvironmental engineering technician, uses a Porta Count machine to perform a gas mask fit test at Ellsworth Air Force Base, S.D., July 1, 2013. During the upcoming operational readiness exercise, members of Ellsworth will be expected to practice mission oriented protective posture drills while wearing their gas masks. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)
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