A fighting force has to have loyalty. The only loyalty remaining in Iraq is along ethnic/religious lines. It's over in Iraq.

The Kurds have their first sovereign borders. I think Syria has a real problem with ISIS and I can't think of any better country to handle it. 

In order for the USA to even consider an invasion into the area, it would require NATO commitment with a full scale invasion with intentions to kill and slaughter 100s of thousands of people. There is no loyalty in the ranks of the Iraq forces and they would slaughter American troops (Green on Blue attacks). 

Enough. It is time the Middle East settle it's own problems. 

July 13, 2014
By Eric Schmitt and Michael R. Gordon
 
WASHINGTON — A classified military assessment (click here) of Iraq’s security forces concludes that many units are so deeply infiltrated by either Sunni extremist informants or Shiite personnel backed by Iran that any Americans assigned to advise Baghdad’s forces could face risks to their safety, according to United States officials.

The report concludes that only about half of Iraq’s operational units are capable enough for American commandos to advise them if the White House decides to help roll back the advances made by Sunni militants in northern and western Iraq over the past month.

Adding to the administration’s dilemma is the assessment’s conclusion that Iraqi forces loyal to Prime Minister Nuri Kamal al-Maliki are now heavily dependent on Shiite militias — many of which were trained in Iran — as well as on advisers from Iran’s paramilitary Quds Force....