@LUHE: "Boots on the ground? I'm not so sure."
The Kurds are few in number and don't have the manpower to do everything that is necessary to choke of ISIS including guarding those oil fields which give them 1-3 million dollars a day worth of funding. A relatively large number of troops would also be needed, temporarily, to guard the borders through which ISIS smuggle supplies in and sell oil out.
We would only have to be there for less than a year as they mop up the last remnants of ISIS.