Once upon a time, there was a grand and influential foreign policy doctrine. It was based on some traditional notions about U.S. statecraft that placed severe constraints on when America went to war. It asserted that when the United States used military force, it must do so in overwhelming fashion and only in the service of vital national interests. For any military action, it counseled the dispassionate weighing of costs and benefits, recommended that policymakers have clear, realistic and achievable political objectives, and called for the strong support of the American people and a clearly defined exit strategy.
This doctrine was called the Powell Doctrine, and it was based, in large measure, on a long-simmering debate in the military about how, when and where the United States should use force. While many in the military thought it was great, a lot of other folks hated it. ...
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