https://thespectator.com/topic/lloyd-austin-mistake-career-ending/
When the secretary of defense goes AWOL, the clear chain of command is severed.
The disappearance of defense secretary Lloyd Austin for a few days without notifying the White House, or even the second in command at the Pentagon, is more than a one- or two-day story.
It’s a much larger problem. It’s a problem politically for the White House, an opportunity for Republicans, a dilemma for congressional Democrats and a problem for the most powerful military in the world. And, of course, it’s a major problem for Secretary Austin’s future in the position.
Let’s start with the problem for the military. It is absolutely essential that the military have a clear chain of command that is clearly specified and operational at all times. Within the military, that chain of command goes up to the senior-most officer in each service branch. The chairman of the joint chiefs of staff is above them in the military hierarchy.
Because the US military operates in a democracy, where political control is essential for major decisions, the top military officials are beneath a civilian secretary for each branch. All of them, plus the chairman of the joint chiefs, are beneath the civilian secretary of defense, who is appointed by the president, subject to Senate approval, and is supervised by the president himself. The civilian secretaries of each branch are also nominees that must be approved by the Senate. That, then, is a clear chain of command under civilian control.
When the secretary of defense goes AWOL, that chain of command is severed. The severance appeared to be even more severe because the second in command to Secretary Austin was herself on vacation and not informed of his being out of the chain because he was in the intensive care unit.