Shortly after the Iraqi city of Fallujah fell to the Islamic State (ISIS) in January 2014, President Obama was interviewed by The New Yorker. When asked about the loss of such an iconic city from the U.S. war in Iraq, Obama responded with his usual glibness: “The analogy we use around here sometimes, and I think is accurate, is if a jayvee team puts on Lakers uniforms that doesn’t make them Kobe Bryant.” Less than six-months after he made those comments, Obama’s “jayvee team” would establish an Islamic “Caliphate” spanning two countries, with an estimated 31,000 fighters from all over...