I have always opposed the War in Iraq on grounds that the weapons inspectors found no WMDs and that there was a lack of international cooperation. However, I feel that now that we are in Iraq our troops must stay as long as necessary to secure the country as well as possibly to prevent Civil War or the return of Saddamites.
Are you saying that you have absolutely no defeat conditions? Or are you just deliberately keeping them secret?
Provided that the insurgents don't gain an atomic weapon and threaten nuke Israel or if they have the capabilities the U.S., I really don't think we should concede defeat at all.