It only took a dozen years, but we might finally have the answer to the question, “What would the Iraq War’s early days have looked like had Turkey joined the U.S.-led coalition in 2003?” If the last two weeks are any indication, we should be relieved the Turks punted the first time around. One can understand the logic of U.S. efforts in recent weeks to incorporate Turkey in the anti-ISIS coalition—and the U.S. excitement at the Turks’ agreement to join. As the coalition intensifies its activity, the Turks provide the United States with use of Incirlik Air Base and greater...