The fact that the US and NATO have supplied ISIS with weapons (and most likely manufactured the whole enterprise) complicates matters. How can we stand together when those in charge only care about money and control, and not human rights?
Only the passage of time can reveal the merit of action and the significance of events. US involvement in Iraq cannot be fully or cogently assessed until the dynamics have progressed to their dialectic conclusion.
Meanwhile, you KNOW you honored your oath and that you did your duty well. Many other men know not such.
Semper fi, Marine.