I'm not saying they got them from the soviets, but the fact is that one of the reasons that the Soviets failed was the effective use the Afghans made of shoulder fired missles that bacically shut down the soviet air offensive. We need to remember that initially Afganistan was an outstanding US covert success, but when we left, we left so fast that we never disarmed the mujahadeen and that is why the Taliban had success because these were the troops that had been using these weapons for years. I don't think anyone really knows what was left behind but it was alot and it was in the hands of people who knew exactly how to use them...Remember, Osama Bin Laden was already a mujahadeen leader at the time of the pull out.
True, but no one says we gave ANYTHING bigger than a stinger to the Afghans, and certainly not a "Grail." So the issue of where such a missile would come from is not minor.