Isn't it traditional in America to fire off guns in the air sometimes as a way of celebrating? Or is that just in old time westerns?

No Americans with even a scratch, Nobody taken prisoner, even though it appears that there were troops on the ground as well, who came in shooting after the helicopters had done their stuff.

Here is an account of what happened in the wedding at Ramadi, from a reporter on thne ground, carried in today's Guardian: 'US soldiers started to shoot us, one by one' -
Survivors describe wedding massacre as generals refuse to apologise

And here is a bit about the groom's sister-in-law, Mrs Shihab, who lost two young sons in the massacre:

She lay there and a second round hit her on the right arm. By then her two boys lay dead. "I left them because they were dead," she said. One, she saw, had been decapitated by a shell.

"I fell into the mud and an American soldier came and kicked me. I pretended to be dead so he wouldn't kill me. My youngest child was alive next to me."

Somneone mentioned what hapened to Native Americans a few posts back. This sounds like it fits in chillingly with that record.