131209-M-FJ744-204

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Marines of Company A, 1st Recruit Training Battalion, do jumping jacks in the Confidence Chamber at Edson Range aboard Marine Corps Base Camp Pendleton, Dec. 9. Marines performed exercises to bring up their heart rates, simulating combat stress, while in the chamber.

131209-M-FJ744-204.JPG Photo By: Lance Cpl. Tyler Viglione

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Marine Corps Recruit Depot - Marines of Company A, 1st Recruit Training Battalion, do jumping jacks in the Confidence Chamber at Edson Range aboard Marine Corps Base Camp Pendleton, Dec. 9. Marines performed exercises to bring up their heart rates, simulating combat stress, while in the chamber.

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