In a largely invisible cost of the war in Iraq, nearly 800 civilians working under contract to the Pentagon have been killed and more than 3,300 hurt doing jobs normally handled by the U.S. military, according to figures gathered by The Associated Press.

Exactly how many of these employees doing the Pentagon’s work are Americans is uncertain. But the casualty figures make it clear that the Defense Department’s count of more than 3,100 U.S. military dead does not tell the whole story.

“It’s another unseen expense of the war,” said Thomas Houle, a retired Air Force reservist whose brother-in-law died while driving a truck in Iraq. “It’s almost disrespectful that it doesn’t get the kind of publicity or respect that a soldier would.”

Employees of defense contractors such as Halliburton, Blackwater and Wackenhut cook meals, do laundry, repair infrastructure, translate documents, analyze intelligence, guard prisoners, protect military convoys, deliver water in the heavily fortified Green Zone and stand sentry at buildings – often highly dangerous duties almost identical to those performed by many U.S. troops.

The U.S. has outsourced so many war and reconstruction duties that there are almost as many contractors (120,000) as U.S. troops (135,000) in the war zone.

The insurgents in Iraq make little if any distinction between the contractors and U.S. troops.

In January, four contractors for Blackwater were killed when their helicopter was downed by gunfire in Baghdad. In 2004, two Americans and a British engineer were kidnapped and decapitated. That same year, a mob of insurgents ambushed a supply convoy escorted by contractors, burning and mutilating the guards’ bodies and stringing up two of them from a bridge.

But when contractors are killed or wounded, the casualties are off the books, in a sense.

While the Defense Department issues a news release whenever a soldier or Marine dies, the AP had to file a Freedom of Information Act request to obtain figures on many of the civilian deaths and injuries from the Labor Department, which tracks workers’ compensation claims.

By the end of 2006, the Labor Department had quietly recorded 769 deaths and 3,367 injuries serious enough to require four or more days off the job.

“It used to be, womb to tomb, the military took care of everything. We had cooks. We had people who ran recreation facilities. But those are not core competencies you need to run a war,” said Brig. Gen. Neil Dial, deputy director of intelligence for U.S. Central Command.