Emeralds, Lapis Lazuli, marble
Emeralds, Lapis, etc... should be an encouraged means for trading. Afghans are also known to be great linen weavers. I'm sure the Afghans would love to have a pc in every home, school books...
http://www.globalpolicy.org/security/docs/emerald.htm
If the Afghans are smart, they'll trade with us in that regard. As long as it's not Opium. I'm sure they don't want to survive in that country living on humanitarian aid alone. Most seem eager to move on. Trading should be encouraged.
Marcia