The Nation has a long article containing inverviews with U.S soldiers that were stationed in Iraq. You want to read it: thenation.com
“As an American, you just put your hand up with your palm towards somebody and your fingers pointing to the sky,” said Sergeant Jefferies, who was responsible for supplying fixed checkpoints in Diyala twice a day. “That means stop to most Americans, and that’s a military hand signal that soldiers are taught that means stop. Closed fist, please freeze, but an open hand means stop. That’s a sign you make at a checkpoint. To an Iraqi person, that means, Hello, come here. So you can see the problem that develops real quick. So you get on a checkpoint, and the soldiers think they’re saying stop, stop, and the Iraqis think they’re saying come here, come here. And the soldiers start hollering, so they try to come there faster. So soldiers holler more, and pretty soon you’re shooting pregnant women.”