A secret Pentagon study has found that as many as 80 percent of the Marines who have been killed in Iraq from wounds to their upper body could have survived if they had had extra body armor. Such 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 now worn by the majority of troops 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.

The vulnerability of the military's body armor has been known since the start of the war. Still, the Marine Corps did not begin buying additional plates to cover the sides of their troops until last September, when it ordered 28,800 sets, Marine officials acknowledge.

The Army, which has the largest force in Iraq, is still deciding what to purchase, according to Army procurement officials. They said the Army was deciding between various sizes of plates to give its 130,000 soldiers, adding that they hoped to issue contracts this month.

Additional forensic studies by the Armed Forces Medical Examiner's unit that were obtained by The Times indicate that about 340 American troops have died solely from torso wounds.

The Times obtained the three-page Pentagon report after a military advocacy group, Soldiers for the Truth, learned of its existence. The group posted an article about the report on its Web site earlier this week. The Times delayed publication of this article for more than a week until the Pentagon confirmed the authenticity of its report. "Our preliminary research suggests that as many as 42 percent of the Marine casualties who died from isolated torso injuries could have been prevented with improved protection in the areas surrounding the plated areas of the vest," the study concludes. An additional 23 percent might have been saved with side plates that extend below the arms, while 15 percent more could have benefited from shoulder plates, the report says.

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