That hardly matters as we can't stay there forever. This should have been a limited mission, over within a year. Seventeen years in a landlocked country and at the mercy of somewhat allied bordering nations is insanity.
Following 9-11-2001 we should have told Afghanistan to hand over Bin Laden within 30days, or prepare tto carpet bomb the entire surface area, until he is dead, turned over, or life no longer lives there.
The US got queasy over Hiroshims/Nagasaki but we also haven't decisively won a major war since then, either.
Note the Japs haven't been a problem, too.
Our military and our tax payers, deserve to win wars, not allow them to linger on by half-measures indefinitely.
Short wars are humanitarian.