“... as pressure mounts over US forces’ continued refusal to leave Kabul airport.”
The US forces are much more likely very willing to leave the Kabul airport and rescue people - but are following orders to stay and not leave the airport. Their “refusal” is following orders - if they left they would be court-martialed.
I would argue that they can disregard any order that is deemed illegal or immoral as that one is. But that’s just my opinion.