Some good points Justa Picker but consider:
1.If we have a coalition like in Desert Storm, Iraq and Iran will stay out of it.
2.China, Pakistan, and Russia are backing our play. So, unlike the Vietcong, the Afghans would be short on refuges. Under the circustances, I think that the Russians will be very helpful with intelligence.
3.Don't forget that we were involved with the Afghans during their struggle with the Russians, so we have some of the same insights as we did with the Iraquis.
However, we are in agreement that the Afghans are badasses. But so are Marines, especially if their hands aren't tied half the time as in Vietnam.