America is debating how to respond to the terrorist attacks in Paris. Unfortunately, both President Obama’s current policy and other recent proposals lack a strategic vision for the Middle East once the Islamic State, or ISIS, is actually defeated. There are no answers, or only outmoded ones, to the basic question: What comes after the Islamic State?Before transforming Mr. Obama’s ineffective efforts into a vigorous military campaign to destroy the Islamic State, we need a clear view, shared with NATO allies and others, about what will replace it. It is critical to resolve this issue before considering any operational plans. Strategy does not come from the ground up; instead, tactics flow deductively once we’ve defined the ultimate objectives.