Jorge “El Conquistador” Rivera, mixed martial arts fighter, and Matt Phinney, boxing instructor, demonstrate striking techniques for Marines in the gym at the Marine Corps Air Station in Yuma, Ariz., Oct. 28, 2009. Train the Troops, sponsored and organized by Ranger Up, an MMA clothing company, visited the station to teach Marines mixed martial arts.(Photo by Cpl. Laura A. Mapes) Jorge Rivera (fighter)

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Photo credit: © PJF Military Collection / Alamy / Afripics
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Keywords: armed, conflict, forces, military, states, united, war