Senior Airman Brandon Jadwin, 28th Aircraft Maintenance Squadron electrical and environmental technician, inspects the molecular sieve oxygen generating system in a B-1 at Ellsworth Air Force Base, S.D., April 4, 2013. The MSOG supplies clean oxygen to the aircrew’s flight masks. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)
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