Interesting interview with CIA legend Milt Bearden, who oversaw the covert supply program to the Afghan muj in the 1980's:

Interview: 'Don't Try to Convince Yourself That You're in Control' - Afghan lessons for arming the Syrian rebels from the CIA's mujahideen point man, by Joshua Keating. Foreign Policy, 14 June 2013.
With the announcement that the United States is planning to begin providing small arms to rebel groups in Syria, Bearden is blunt as to what the CIA's experience in Afghanistan in the 1980s should teach us. "The lesson here is that once we start providing anything to the rebels, we better understand that if they win, we own it," he told Foreign Policy on Friday, June 14. "The big cheerleaders on the Hill for doing this aren't focused on this. The biggest lesson from the Afghan thing was that over a 10-year period we supplied all this stuff and then walked away once the Soviets left. The same Congress that was cheerleading the brave freedom fighters against the Soviet occupation -- and they were brave and they did suffer brutally -- just walked away and wouldn't give them a nickel. If we start arming anyone in this enterprise, implicit in that is that we own it once the Assad regime falls."
I believe this is a terrible mistake in the making.