So we are told that Obama administration personnel are "vetting" rebel groups in Syria to discover which are "moderate" enough to arm and train. That may be unnecessary. Lately, it looks like Bashir al-Assad is doing it for them. Leaving fighting the Islamic State to the US and its "coalition," Assad's air force has been concentrating its efforts on eliminating the regime's other enemies — notably the less radical Islamist groups. (Incidentally, the only secularists in Syria side with Assad.)
All the USofA can accomplish in Syria and Iraq is stirring the pot, and the best course of action for the USofA is to get the hell out, and let the regional powers — who have the most to lose — sort things out for themselves.