Something you didn't say, something significant, is the US military is made up of US soldiers.

A good many of those soldiers will have "Patriot Sympathies" (of many kinds).

This will lead to a great deal of information leakage, "lost" equipment going to militias, sabotage, etc.

Regardless of oaths to US military, an innate sense of duty to some personal ideal of USA will over weigh for a significant number, and a good percentage of those will remain embedded, organized, and difficult to root out.

They will also exist in various numbers from the lowliest boot to the highest general.