Anyone and everyone who ever spent time in Afghanistan knew to keep Bagram. Bagram is the last place to bug out of. What a frickin disaster.
I wasn't in the military, had no military training, except shooting a rifle and pistol. Of course, have never been to Afghanistan.
A quick look at Google Earth shows Bagram and Kabul sit in a long, dumbbell-shaped valley, surrounded by mountains. Bagram occupies a wider area in the North, while Kabul occupies a smaller, tight section in the South, with only two north-south highways connecting them.
Any fool can see that if you give up Bagram, Kabul is immediately cut-off and surrounded. Are US Generals that stupid?