I think the army thing is an issue as a non-American I find it hard to get my head round. The army in the UK have twice, that I can remember, been called in to act as firefighters when the fire brigade was in dispute with the government. I can't remember there ever being any suggestion that deploying the forces within the country would, could, or ever might infringe our liberties.
If there was a pandemic, and your govt. decided that people ought not to travel, how would it make a difference to you who enforced that edict? What would you lose, as a citizen, if a soldier rather than a policeman did the job?