Just for reference, here's the operative Department of Defense plan for handling a flu pandemic in the United States. It's a .pdf file, and it's 87 pages.
The acronym CONUS, by the way, means continental United States.
Pages 62 and 63 outline the military's emergency powers "in the event of pandemic influenza." Quote: "These powers include restriction of movement and use of containment strategies (isolation, quarantine, social distancing) as well as medical evaluation and treatment."
... Just in case you were wondering what a monstrous civil disruption would occur if a genuine flu pandemic happened.