Straffo
The UN will be begging to help the US rebuild Iraq, not the other way around. The US has independent plan for rebuilding. But the UN and your country France will want a part. Not because they are "humanitarians" but because they have an existing financial interest in Iraqi oil.
No Dowding this threads about the funds needed to rebuild Iraq, not who pays the US military. The US taxpayers pays its soldiers and why are you concerned with that?
The US plan to rebuild Iraq has been linked on this board and is based on the events in Kosovo where private organizations are contracted to fill a variety of needs. The next Iraqi government would have an interest in getting the US out of its major afairs. To do so it would make sense that they help in anyway they can.
In the short term the US is prepared to bring in Food and medicine and has been in contact with the red cross and other groups of this type to distribute this aid.
The US and UK wont lock the UN out and would welcome their help. Especially if it gets our troops home and saves us money. In the case with UK they may want the UN their but the US wont go on bended knee to an irrelevant organization. Regardless of what the UN does the US will depose Saddam, liberate and rebuild Iraq.
These are inescapable facts. You can make up any motivation you want, hold all the candle light hippy degenerate marches you want, espouse nutty conspiracies etc... But these arguements are as irrelevant as the UN.