I hope it doesn't run the same course as Vietnam, but it looks similiar:
We initiate a shooting war under what turns out to be a false premise (Gulf of Tonkin then, WMD now), proceed under a new justification (communist domino effect then, liberate Iraq now), things begin to go bad and it becomes irresponsible of us to walk away. Turns out we were part of the problem then, not part of the solution. I dearly hope that is not the case here.
God bless America, God bless our (and ALL coallition) troops, and may God have mercy on us all.
Peace.