Ted Koppel has been airing a segment for months on each edition of "Nightline" that lists U.S. military fatalities in Iraq. On Friday, Koppel and the "Nightline" team will turn the entire show over to naming those killed in combat in that conflict. "We'd been doing something called 'In the Line of Duty,'" Koppel said. "We were all beginning to feel it as sort of humdrum - it wasn't having any impact." The sense among the show's staff was that the deaths were seen as mere numbers - two here, three there. "Nightline" executive producer Leroy Sievers approached Koppel with...