A pilot tests his oxygen mask before flying at Joint Base Langley-Eustis, Va., Feb. 27, 2017. Pilots tests their oxygen masks before each flight to ensure they are in working order providing safety for the entirety of their world-wide missions. ( Air Force photo by Staff Sgt. Natasha Stannard)

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Size: 4267px × 3049px
Photo credit: © AB Forces News Collection / Alamy / Afripics
License: Licensed
Model Released: No

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