From a CNN email: ISIS, the terror group that calls itself the Islamic State, "can muster between 20,000 and 31,500 fighters across Iraq and Syria," a CIA spokesman tells CNN. That is two to three times more than the 10,000 fighters previously estimated by the CIA." Get complete coverage of breaking news on CNN TV, CNN.com and CNN Mobile. If these numbers are correct - that would be equivelant to 2-4 US Army Divisions. If the US did send boots - WITH THE INTENTION OF UNCONDITIONAL SURRENDER - how many Divisions should the US Military send?