Is the US ripe for a coup?

[Anomalocaris]

The circumstance we are talking about is unprecedented in the history of modern US military, and the closest analogue would be with germany’s Wehrmacht under Hitler.

Not at all. The German officer corps followed the Prussian school, and an oath (like the one they swore to Hitler personally) was beyond sacred to them. I swore an oath to defend the Constitution of the United States against all enemies, foreign and domestic. There is a difference there.

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The difference is superficial.  The underlying behavior is more likely to be similar.

The personal oath of fealty to Hitler was likely not decisive in the actions of many, probably the majority, of whermachr's senior officers.   That oath to Hitler constrained their choices was largely a post war fiction designed to rehabilitate the reputation of the German army in order to rearm Germany as a member of NATO.   The fiction of the clean and dutiful Prussian officer vs the villainous SS has been largely dispelled by German historiography since the end of the cold war. German army was both quite corrupt and competitive with the SS in the extent of its war crimes.

As a matter of fact, Hitler himself was well aware of the fact that whermachr's oath pacified the rank and file much more than the senior officers who are in position to make decisions in moments of crisis.  As s result, Hitler felt it prudent to personally bribed most of the senior whemacht officers with large cash grants, feudal estates in conquerored Poland, and other benefits such as open ended repayment of personal loans.  In other words the bonds of personal financial interest ties senior German officers to Hitler to a vastly higher degree than is often recognized.

I think when the chips are down, the higher the rank of the officer, the more sophisticated he is likely to be in reconciling his own interpretation of the meaning of his oath with his personal interests. This is likely common to most military services. Military services can not be counted on to risk the personal welfare and career prospects of the the senior officer Corp to defend the interest of larger country and other social groups unless the social class with which the officier Corp identifies is itself threatened.