From an op ed:
Syria adds another chapter to the star-crossed history of CIA paramilitary action. These efforts begin with the worthy objective of giving presidents policy options short of all-out war. But they often end with an untidy mess, in which rebels feel they have been “seduced and abandoned” by the promise of U.S. support that disappears when the political winds change.
Most important point (low in the piece): you need a geo-political plan for the military component to make any sense. But we knew that, right?