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A candle is lit during the gask mask fit test in order to release particles into the air and create more accurate testing results at Cannon Air Force Base, N.M., July 24, 2012. Bioenvironmental engineers conduct respirator and gas mask fit tests in order to protect and maintain a healthy work force. (U.S. Air Force photo/Airman 1st Class Eboni Reece)


Fit factor: combating unseen enemies

A candle is lit during the gask mask fit test in order to release particles into the air and create more accurate testing results at Cannon Air Force Base, N.M., July 24, 2012. Bioenvironmental engineers conduct respirator and gas mask fit tests in order to protect and maintain a healthy work force. (U.S. Air Force photo/Airman 1st Class Eboni Reece)

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