Writing for PJ Media, Mark Tapscott calls the decision to abandon Bagram Air Base one of the 2-3 greatest blunders in U.S. military history. His article is a decent piece of Monday morning quarterbacking.
Tapscott makes a good case for why that facility should have been the last one abandoned in-country. He may well be correct in his judgment, since it appears most alternatives to the present situation would have been improvements.