What Happens When We Pull Out Economically?

Andrew Exum is worried about the resilience of Afghanistan's economy:

Gunner "Kalev" Sepp told me a few weeks ago that when the United States ended the roughly $8.5 million we had been giving El Salvador in the 1980s during their civil war, the unemployment rate there sky-rocketed to over 50%. (!) What is going to happen when we start cutting aid to Afghanistan's similarly conflict-distorted economy, which I and others have been urging we do for some time?