Thomas---that looks more like a couple of couple of questions!!
1)Thousands during this wonderful "coalition" effort, many thousands more during the ten-year preamble.
2)Mainly in the USA.
3)Probably still in Iraq, dead or alive; but who cares other than the Iraqis thrmselves.
4) That's not quite as easy. Could be oil or Israel's "security" ---or both in combination. One thing is certain, "freedom" as an objective was never even in the queue.