Airmen from the 37th Helicopter Squadron fly over Devils Tower National Monument in Wyoming on a mission Dec. 12, 2017. Air Force pilots are required to fly a set number of hours each year to gain crew coordination and experience.

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Size: 6016px × 4016px
Photo credit: © AB Forces News Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 37hs, 90mw, devils, helicopter, tower