Nothing!! If our troupes stay there 6 weeks or 60 years, the outcome is the same. It's been that way for over a thousand years.
If you've never seen it, get a copy of the old movie 'Song Of The South'. In it Uncle Remus tells a story about Br'er Rabbit and the Tar Baby. There's Tar Babes all over the world. Smart people avoid them.
After 9/11, we should have started bombing the Middle East from high altitude. After getting their attention, we could have struck a deal. "You stay on your side of the creek and we'll stay on our side." That would have included deporting all Muslims.
And we never, ever again deploy troops in WAR without Congressional Declaration as written in our Constitution.
How many brave, patriotic young American's have to die before our freaking politicians get it right.
And the waste continues!