My friend Don served 19 years active duty in the Marine Corps before he was injured by a rocket-propelled grenade in Afghanistan in 2003. He was flown by medivac back to the States, where his family was told that his brain injury was so severe he would never again be able to function on his own. He couldn’t feed himself, go to the bathroom by himself, read, write or talk. But within two years, he had proved the doctors wrong.

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