Power is the great staining, corrupting agent that turns good men to bad. No man is immune to the evil elixir, no person can escape the corrupting influence that power exerts on one political beliefs, or ones patriotism. Like a heroin addicted addict, good men become beguiled by the thought of more power, more power, and the righteous are turned into devils.

A good article is here

So it may not be a very good tell to cite Milley's credentials as a proof that he is a whitehat, in my view.