May I know why this topic can't be taken for a debate? Back in 2003, when the US invaded Iraq under the pretext of finding weapens of mass destruction, they had disbanded Saddam's army. Also thousands of Sunni muslims lost their jobs once the US erected a puppet Shiite regime. In 2005, there was a resisitance against the US backed Shiite regime, which consisted of a large number of former Iraqi soldiers. These soldiers were pioneers in ranks of ISIS.