As others have previously said, no matter what the US does or does not do, it will get slammed on. Considering how the current administration is vacillating on taking firmer actions, it is doubtful that any "hard" decisions will be made regarding the question of support. Guns, missiles and airstrikes? No problem.
Putting American lives at risk to defend someone else? No way. To a large portion the American public, American lives are more important some random Yazidi or Kurd or Iraqi. This goes, IMO, hand in hand with the concepts of American Exceptionalism and the Islamophobia (and correlating xenophobia) that has been rising over the past decade and a half.
Working as a teacher, I can see huge pressures to focus internally. Infrastructure is failing, children's education is underfunded or lacking resources. So, voters will not care about the issues abroad because as far as they are concerned, it's someone else's kids dying, not getting an education, or having their lives destroyed. That money should go to their child, here in the US.
Special Forces ... sure. They're already there though the level of their presence isn't known. You won't see Stryker Brigades being deployed, that's for sure. The current admin will try to keep it all hush-hush unless it has something positive to report and do a little flag-waving.
At the end of the day, freedom, money and comfort for America first. Then everyone else. Basic "Us vs. Them" mentality that has been fostered since Sept. 11th.