If Iraq was a tar baby, Syria is tar zombie mob. Only a complete idiot (McCain, Graham, or Clinton, for instance) would think after our Iraq experience that it could ever be anything more than a bleeding wound for any administration that invests in it. Trump doesn't owe anything to legacy policies, unlike DOD, and so has no stake in doubling down on stupid. Of the four major players in Syria (Us, the Russians, the Iranians, and the Syrian government) we are in the worst logistical position to support operations despite all the 'Best military in the world' horse manure. Everything we do costs ten or twenty times what it costs the opposition to counter, and all three of the other major players are lined up against whoever the Hell we think we're supporting. It doesn't take a genius to see how this is going to work out in the long run if we keep on the course we have been following.