Airman 1st Class Joshua Grant, 9th Airlift Squadron loadmaster, performs a cargo compartment check on a C-5M Super Galaxy while wearing a 358 Quick Don Demist oxygen mask, June 15, 2021. The 9th AS aircrew tested mask modifications for Air Mobility Command’s test and evaluation team which will assist in determining further modifications. (U.S. Air Force photo by Senior Airman Faith Schaefer)
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