The first shots sailed past Iraqi police officers at a checkpoint. They took off in three squad cars, their lights flashing.

It was early in the Iraq war, Dec. 22, 2004, and it turned out that the shots came not from insurgents or criminals. They were fired by an American private security company named Custer Battles, according to an incident report in an archive of more than 300,000 classified military documents made public by WikiLeaks.
The company’s convoy sped south in Umm Qasr, a grubby port city near the Persian Gulf. It shot out the tire of a civilian car that came close. It fired five shots into a crowded minibus. The shooting stopped only after the Iraqi police, port security and a British military unit finally caught up with the convoy.
Somehow no one had been hurt, and the contractors found a quick way to prevent messy disciplinary action. They handed out cash to Iraqi civilians, and left.

The documents sketch, in vivid detail, a critical change in the way America wages war: the early days of the Iraq war, with all its Wild West chaos, ushered in the era of the private contractor, wearing no uniform but fighting and dying in battle, gathering and disseminating intelligence and killing presumed insurgents.
There have been many abuses, including civilian deaths, to the point that the Afghan government is working to ban many outside contractors entirely.

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