A secret Pentagon study has found that at least 80 percent of the marines who have been killed in Iraq from wounds to their upper body could have survived if they had extra body armor. That armor has been available since 2003 but until recently the Pentagon has largely declined to supply it to troops despite calls from the field for additional protection, according to military officials.

The ceramic plates in vests currently worn by the majority of military personnel in Iraq cover only some of the chest and back. In at least 74 of the 93 fatal wounds that were analyzed in the Pentagon study of marines from March 2003 through June 2005, bullets and shrapnel struck the marines' shoulders, sides or areas of the torso where the plates do not reach.

Thirty-one of the deadly wounds struck the chest or back so close to the plates that simply enlarging the existing shields "would have had the potential to alter the fatal outcome," according to the study, which was obtained by The New York Times.