I don't want to sound negative, but the big question is are they reliable? Things did not go well w/ our indigenous troops in Fallujah. I think the differences and conflicts between the various groups in Iraq(Kurd,shitte,sunni,etc)are going to be real hinderances to forming an effective army. Plus you have neighbors Syria and Iran.And of course the msm has a negative effect on moral here and in Iraq.
Things would go better if you didn't use indiginous troops. Send the sunni troops into the shite regions and vice versa.
Seems to me the Romans used to do this. Send the foriegn troops to a region not the native ones.