You "win" when you create conditions that allow the transfer of power and responsibility to the Iraqi government, if that is your political objective. It really comes down to when the political conditions for "victory" are met. If those conditions center on crushing the insurgency, then we will be there for a long time to come.
One reason people may ask this question is that we have done a poor job of spelling out exactly what we mean by victory and winning. We "won" in Korea, but we're still there. The same could be said of Germany. Clearly one was more of a "win" than the other, but both still have U.S. forces deployed on their soil.
I'm not meaning to quibble at all, just thinking out loud on the various meanings of victory and winning.
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