A flight crew chief from the Joint Aviation Command, United Arab Emirates, inspects the M134 GAU-17 Vulcan cannon aboard his UH-60 Black Hawk helicopter prior to the start of an air assault mission during Decisive Action Rotation 17-09 at the National Training Center, Sept. 21, 2017. ( Army photo by Sgt. David Devich, Operations Group, National Training Center)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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