Four competitors carrying 35-pound packs pass a land mark May 18 of the grueling 12-mile ruck sack march May 18 during the 2017 National Guard Bureau Region VII Best Warrior Competition at San Luis Obispo, California. ( Army National Guard photo/Staff Sgt. Eddie Siguenza)

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Photo credit: © PJF Military Collection / Alamy / Afripics
License: Licensed
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