Staff Sgt. Tracey Kolb, 3rd Airlift Squadron loadmaster, tests an oxygen mask on a C-17 Globemaster III before a local training flight at Dover Air Force Base, Delaware, April 22, 2021. The 3rd AS trains to support global engagement through direct delivery of critical theater assets and to ensure combat readiness of Air Mobility Command C-17 aircrews. (U.S. Air Force photo by Airman 1st Class Faith Schaefer)
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