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Military's prized "challenge coins" become copycat fad among agencies, politicians, companies

In the hospital, after her Black Hawk helicopter was shot down in a fireball, L. Tammy Duckworth's fellow soldiers made sure four of her personal items made the trip home from Iraq with her: her wedding ring, her dog tags, her unit patch and a coin she always kept in the breast pocket of her flig...

By Christian Davenport

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