I am glad I am not a senior US military officer now. This is going to be a very severe test and it will only take a few percent of officers turning trumpist to turn DoD inside out. DoD has no institutional history of significant dissention among its members and will be largely lost trying to figure out what to do with disloyal members and units.
Remember that most of the MAGA line for the last 8+ years has been that the Dems are unconstitutionally destroying the USA with their federal overreach and never-ending assault on fundamental freedoms. Meanwhile it’s the Rs, and most especially trump himself, who are the bulwark of defense of our mighty and perfect 1770s-appropriate constitution. Or so the propaganda spew insists all day every day.
To the degree some officer has spent 8-12 years drinking that firehose of Kool-aid they may well most sincerely believe that defending trump & MAGAtism is defending the Constitution.