Senior Airman Brian Wells, a 22nd Aircraft Maintenance Squadron guidance and control maintenance technician, tightens his gas mask to ensure it fits properly, Jan. 26, 2010, during a survival skills training class at McConnell Air Force Base, Kan. Emergency management instructors provide gas mask training to active-duty and Guard member here before they deploy. One complete, training certification lasts two years. (U.S. Air Force photo/Airman 1st Class Andrea Salazar)
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