The report released by the Defense Department inspector general revealed that in fiscal 2023 there were 183 allegations of extremism across all the branches of military.
Sure, but again I think you're underestimating just how enormous the US military industrial complex is. It'd take a notable percentage of mid to high ranking individuals to cause a significant amount of damage to the US's military. You also have to consider the military isn't just service members, but also civilians and contractors, so add in another few million people to that number.
Jan 6th wasn't even remotely close to Trump actually succeeding in his half-assed coup attempt. The only real danger during that election was from the conspicuous attempts from Trump to get states to overrule the election results, which has nothing to do with the military.
I'm not saying this particular report isn't concerning, I'm just saying it isn't cause to become seriously worried for the future of the military's allegiance to the constitution and their impact on the democratic process.