How could the US possibly lose? Well, obviously not in any outright confrontation. Iraq has no chance of waging any effective war without WMD. I don’t believe it has any and I doubt it will use any if it did.
The best tactic for Saddam is let the US walk right into Bhagdad. He should disband his regular army into cells that will then perpetrate acts of ‘terrorism’. There should be enough conventional arms in circulation to make the occupying forces life a nightmare. The US intends to be in Iraq for some extended period while it restructures the country to its liking. Likely a number of US companies will be involved in rebuilding parts of it. During this period its troops and others will become sitting ducks to the unseen enemy. Iraqi forces will resort to ambushing the unwary, planting bombs and no doubt suicide bombings also. Paranoia and panic will pervade.
In this country we were crippled by the IRA who could evade capture and terrorise the UK mainland. There was no real answer to a determined and equipped enemy. The Palestinians wage a war of sorts against the Israelis. Its crude but effective. Not many Israelis feel very safe getting on a bus or eating out despite massive military superiority. They live in fear. All Saddam has to do is abandon his airfields and tanks. Let them be destroyed by the US. When the US looks for his army, there won’t be one. Not in the expected sense anyway. This will degenerate into a Vietnam quite easily. I don’t think you can expect anything less.
ISP