Participants of the 10th Annual Recon Challenge/Challenge Recon competition operate an AN/PRC-117 radio at the third checkpoint of the course in the 52 Area, Marine Corps Base Camp Pendleton, Calif., May 17, 2018. The challenges consisted of mentally and physically demanding tasks such as hiking, swimming, radio operation, obstacle course, casualty carries and marksmanship. ( Marine Corps photo by Lance Cpl. Drake Nickels)

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