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Seventy-five years ago, Key Underwood and his raccoon-hunting dog Troop had a connection. Years of training and a deep relationship make human and canine a seamless hunting unit. The two can share a special bond.

So when old Troop died, Underwood buried him on the crest of a hill hidden away in the lush countryside near Cherokee, Ala. It was Underwood's favorite hunting spot. He marked the grave with an old chimney stone he chiseled with a hammer and screwdriver.

In 2010, NPR reported that some Army commanders refused to award the Purple Heart to many troops who got concussions in combat because they didn't consider these "real" injuries. As a result of our story, the Army did its own investigation and put out new guidelines on Purple Hearts. Last week, the Army told NPR that under the new rules, they've finally awarded the medal to almost 1,000 soldiers, including Michelle Dyarman, whom we profiled in our original 2010 reports.