Out with the old in with the new
SIOUX FALLS, S.D. -- Members of the South Dakota Air National Guard helped wingmen adjust their new gas masks to attain a proper seal during training for their new M-50 Joint Services General Purpose Gas Mask January 6th 2013.(National Guard photo by Master Sgt. Christopher Stewart)(Released)

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Photo by: Master Sgt. Christopher StewartReleased |  VIRIN: 130106-Z-TF102-026.JPG