To put on a hawkish hat for a moment, the US never fights to win. The Korean police action, Vietnam, Iraq, Afghanistan to name a few. If you want to get rid of a bug you stomp on it not tease it and make it more angry.
Now if I put my real hat on.... why were we really in any of those countries spending the hard earned money of the people who never wanted to be there to begin with?
And a bit of prognostication: Venezuela is next on the hit list.