President Obama announced Friday that he was replacing retired Marine Gen. John Allen with lawyer and diplomat Brett McGurk as his special envoy for Iraq and Syria with a wide-ranging portfolio that includes holding together a coalition against ISIS. Allen, who reportedly had clashed with the military over the now-defunct $500 million effort to create an army of Syrian volunteers, was departing after 13 months as special presidential envoy for the global coalition to counter the Islamic State of Iraq and the Levant, or ISIL, another name for the terrorist group.