Yes, let's finish in Afghanistan

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Then, let's finish in Iraq. Then, let's announce a five year withdrawal of all troops from around the world and the closing of all U.S. military bases. Then let's create a new foreign policy doctrine: The U.S. will maintain a non-interventionist policy regarding foreign affairs. If attacked, we will respond with brutal force when and if the attackers can be geographically located, then immediately return our troops home leaving the aftermath to the offending country - otherwise, we will mind our own business.