Split-second, no-choice decision haunts unit Fri Apr 11, 5:39 AM ET BAGHDAD I t wasn't supposed to be this way. They weren't supposed to kill one of their own. But each night, soldiers in the Headquarters Company, 4/64 Task Force, 2nd Brigade, 3rd Infantry Division, go to sleep thinking about Capt. Ed Korn -- a man they barely knew but now can never forget. They cannot shake the memory of April 4, when they mistook Korn, 31, for an Iraqi fighter and unwittingly killed him. ''We talk about it every day,'' said the 28-year-old commander of a tank-like Bradley Fighting...