Staff Sgt. Sean Waterman, course chief, Reconnaissance Training Company, Advanced Infantry Training Battalion, School of Infantry-West, looks through a M71 scout sniper observation telescope during the marksmanship portion of the 10th Annual Recon Challenge on Marine Corps Base Camp Pendleton, Calif., May 17, 2018. The challenge was comprised of eight checkpoints that tested participants physically and mentally. ( Marine Corps photo by Cpl. Juan C. Bustos)

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