Airmen Vanessa Ibarra and Joshua Estime, 361st Training Squadron aircrew flight equipment apprentice course students, check the Scott 358 Folding Quick Don oxygen mask at Sheppard Air Force Base, Texas, August 30, 2017. The mask is used to provide emergency oxygen to aircrew in the event of loss of cabin pressure. In this course, students ensure that all flight safety equipment is perfect working order. (U.S. Air Force photo/Liz H. Colunga)

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Photo by: Liz Colunga |  VIRIN: 170830-F-NW376-014.JPG