There is no way for our troops/citizens to get out except by air, and no nearby ground, naval, or air support. Nor are there any natural defenses and they are surrounded by a hostile city. Who is supplying the food and water? A few shoulder fired missiles or AAA batteries can stop all air traffic.
This is a total catastrophe in the making.
I read where the US military is in contact with the Taliban leadership to workout an orderly withdrawal...but that could change at any time....
It might be possible to drop paratroopers on a small installation, such as Camp Dwyer, which has a runway that is long enough for a C-17, and might hold its weight. It has few civilians around it, so it should be possible to secure a decent footprint without having to deal with the swarms in Kabul, and it was secondary enough that you would not expect the Taliban to have a large number of men looting/guarding captured weapons and supplies like you would expect at Bagram. Fly troops and supplies in to Camp Dwyer on big planes, shuttle civilians and troops there in helicopters, and fly'em out out on the big planes.
That might work very well. Except for the guys still on the ground when the Taliban manage to get artillery within range of the airfield...