Shoot to kill

"Heavily armed private security contractors, who number in the tens of thousands, also are authorized by the U.S. government to use deadly force to protect themselves.

One contractor who works for the U.S. government and saw a colleague killed in a suicide bombing said it was better to shoot an innocent person than to risk being killed.

'I'd rather be tried by 12 than carried by six,' said the contractor, who insisted that he not be identified by name because he was not authorized to speak to the media.

The U.S. military says it investigates all shootings by American personnel that result in death. But U.S. Brig. Gen. Don Alston, spokesman for the multinational force in Iraq, said he was unaware of any soldier disciplined for shooting a civilian at a checkpoint or in traffic. "