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When they came home, many of the world's fittest and best trained warriors were never the same. Headaches. Numbness. Dizziness. A cancer that would put them in a flag-draped coffin. I know. One of those soldiers was my son, Major Beau Biden, we don't know for sure if a burn pit was near where his hooch was near, in Iraq or earlier than that in Kosovo, was the cause of his brain cancer, or the diseases of so many of our troops. But I'm committed to finding out everything we can.