From Business Insider:

US Defense Secretary Ashton Carter recently told a Washington committee that the military was falling far short of its training goals in Iraq…The training failures highlight a massive contradiction that is crippling Obama’s strategy to combat Sunni extremist group the Islamic State in Iraq and Syria. While the president insists that Sunnis are a crucial part of the plan to defeat ISIS, the administration is achieving little as the Syrian regime of Bashar Assad slaughters Sunnis in droves and the Shia-dominated government in Baghdad avoids arming and training Sunnis out of fear that they might one day rise up against Baghdad.