The senior officer corps is dominated by highly-competent and committed individuals who absolutely despise Trump for many very obvious reasons. He may have some popularity among the enlisted ranks, but they aren’t the people who know how the machinery operates on a macro scale. Real warfare requires coordination on a massive scale and nobody outside of the Pentagon is in any position to make that happen. Do you know how to command a carrier group or an infantry division? Do I? The only people who do are elite high-ranking officers.