answer:The people. We remember what happened last time, and would severely punish any government that dragged us back into that mess in the same capacity as we were in. That said, there are boots on the ground in a non-combat role. Allied nations either have sent or are sending special forces to advise and train local fighters, as well as identifying and marking targets for the precision bombing raids. Many types of guided munitions only with with a guy on the ground with an infra-red strobe. I don’t think ISIL operates with a single headquarters. Years of insurgency has surely taught them what a bad idea that is without air supremacy. They are most likely operating in a distributed manner, sending messengers to make anonymous phone calls to each other. That is how Bin Laden communicated, and how he was eventually caught, but it remains an effective technique. One way or another, ISIL will be broken. However it will most likely remain a war fought through proxies such as the Kurdish Peshmerga unless there is a huge escalation from this already serious situation. The electorate just doesn’t have the stomach for another protracted war. We struggle to accept that this war is by its very nature unwinnable.