Tech. Sgt. Alexander Johnston, 100th Operations Support Squadron aircrew flight equipment lead trainer, tests a quick-don oxygen mask for functionality at RAF Mildenhall, England, Dec. 3, 2019. The AFE Airmen protect aircrew by ensuring their equipment is operational and free of defects. (U.S. Air Force photo by Airman 1st Class Joseph Barron)

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Photo by: Airman 1st Class Joseph Barron |  VIRIN: 191203-F-PZ401-1013.JPG