U.S. Marine Corps 1st Sgt. Greg Zieba, front left, and Capt. Timothy Chun, front right, lead Marines from Detachment One, Communication Company, Combat Logistics Regiment 45, 4th Marine Logistics Group on a ruck march during a 'Grissom Ghouls 5K' at Grissom Air Reserve Base, Ind., Oct. 31, 2013. While many of the run's participants dressed up in costumes, the Marines donned the heavy packs as they successfully accomplished the race. (U.S. Air Force photo/Tech. Sgt. Mark R. W. Orders-Woempner)
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