WMAR Nightline December 31, 2011
this is "nightline," december 30th, 2011. good evening, all, i'm bill weir. for american troops serving in afghanistan, one killer has surpassed all others. the improvised explosive device. they have either taken the lives or shattered the bolds of more than 8,000 u.s. service members of that war. and they are such a relens lent scourge because they are so easy to make, with a couple of ingredients that end up being disturbingly easy to buy. here's nick schifrin with our series, "nightline investigates." >> reporter: down every rutted road in afghanistan, nothing scares u.s. troops...
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