Icemen test their ability to survive and operate
U.S. Air Force 1st Lt. Brooke Cantrell, 354th Maintenance Squadron flight officer in charge, checks for a proper seal on her M-50 protective mask during an operational readiness exercise Nov. 6, 2012, Eielson Air Force Base, Alaska. The M-50 protective mask can provide up to 24 hours of continuous respiratory protection in nuclear, biological and chemical environments. (U.S. Air Force photo/Staff Sgt. Jim Araos)
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