Master Sgt. Chris Willey, noncommissioned officer in charge of the 168th Operations Support Squadron Weapons and Tactics section, explains the steps of donning the Emergency Passenger Oxygen System, or EPOS, to Cadet Valerie Frank during the cadets’ pre-flight briefing May 4, 2017, on Eielson AFB, Alaska. Frank is one of nine cadets from North Pole High School, North Pole, Alaska, who took an incentive flight with the 168th Wing during joint training exercise NORTHERN EDGE 2017.

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