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U.S. Air Force Staff Sgt. David Hewitt, 27th Special Operations Civil Engineer Squadron explosive ordinance disposal flight, gets a fit test for an 3M gas mask 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

U.S. Air Force Staff Sgt. David Hewitt, 27th Special Operations Civil Engineer Squadron explosive ordinance disposal flight, gets a fit test for an 3M gas mask 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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