By Will Dunham Fri Jan 6, 11:19 PM ET WASHINGTON (Reuters) - Better body armor could have prevented or limited about 80 percent of fatal torso wounds suffered by Marines killed in Iraq, a report by U.S. military medical experts obtained on Friday said. The report, conducted for the Marine Corps by the Office of the Armed Forces Medical Examiner and not released to the public, examined the cases of Marines fatally wounded from the start of the war in March 2003 through June 2005, and found weaknesses in the torso protective gear. Bullets or shrapnel hit the Marines' shoulders,...