April 7, 2003 A Sinister Past Comes to Light at an Iraqi Post By JIM DWYER ARBALA, Iraq, April 6 — To the Americans who arrived by tank and helicopter and Humvee, this city 45 miles south of Baghdad began to reveal itself today in hints of a sinister past in captured military archives. Inside a bombed military headquarters, soldiers found strips of film negatives showing images of people who appeared to have met violent deaths. The images, shown to a reporter, appeared to document injuries on the bodies of three different people. Scores of other negatives kept in the...