That presupposes that the "Army" is the only Army with arms and motive to do the Left's bidding - how many more Federal agencies have lots of folks who have become armed despite historical norms of most not being armed? How much of a "civilian force, funded and armed every bit as well as the military" has been put in place while we slept?
The civil force will fall apart as soon as all the leaders and people with skills walk away leaving sodomites and AA’s and tons of women with no skills. Those same people will then join efforts to destroy whats left of the federal force.
Same thing would happen to our military.