Army Sgt. Robert Samuel knew that he'd lost much of his leg almost as soon as the improvised explosive device went off beneath his Stryker armored vehicle in Afghanistan. Bloodied and dazed, he asked his buddies to grab what was left of him as they yanked him out of the wrecked vehicle. (Olivier Douliery/Abaca Press/MCT) ( / Olivier Douliery/Abaca Press/MCT)