In 2010, nearly 1,000 U.S. Marine officers and enlisted men of the 3rd Battalion, 5th Regiment deployed to Helmand province in southern Afghanistan. By the time their tour ended in April 2011, the Marines of the 3/5 — known as "Darkhorse" — suffered the highest casualty rate of any Marine unit during the past 10 years of war. 25 dead and 184 wounded, with 34 losing at least one limb over the course of the deployment. But the Marines say it was worth it. "It went from total war-fighting of three months to saving lives and rebuilding homes," says Sgt. John Decker.

WORKOUT:

5 Rounds:
5 Deadlifts 
10 Burpees
15 Air Squats
400m Run

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