Army Sgt. Jerrell D Knight, assigned to the 39th Signal Battalion, adjusts the rear sight windage of an M4 carbine under the supervision of 1st Sgt. Scott B. Null and Staff Sgt. Astin P. Muse at the 25 meter range on Chièvres Air Base, Beligum, Oct. 24, 2016.

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Size: 1155px × 1731px
Photo credit: © David Wa / Alamy / Afripics
License: Licensed
Model Released: No

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