What are the quarantine rules for those entering the US and US citizens reentering the US? (homes)

[citizensadvocate]

I be curious what the CDC says about this one.

While mostly nonessential travel i.e non citizens going to another country for vacation or shopping, activities allowed by Visa waivers/tourist visas had been curtailed. We do hear about Quarantine rules of going to different countries. Mostly its for returning citizens or those who have permanent residency in those countries.
Mostly Quarantine periods are last resort efforts to control spread for those who must be allowed to enter a country i.e a returning citizen which under international law and most all country's constitutions cannot be denied entry as they have right of abode. Or a non citizen who have permanent residency, owns homes, or businesses as well as those who may be visiting a dying or bereaved family member. Countries typically don't allow non citizen vacationers to quarantine even if they are willing to pay.

However I and people I know haven't heard clear info on what are the rules for citizens or those who must enter/return to US entering from Foreign countries. It appears the US requires citizens and certain permitted non citizens returning from certain countries to Quarantine i.e China, the UK, and continental Europe. Though does this mean people disembarking International flights from certain locations are taken to a secure facility along with their luggage were they can stay until they pass tests?

I remembered last year anyone returning from China, Iran, and parts of Europe including US citizens(non citizens even sometimes spouses of US citizens were denied boarding flights to US) were taken directly to a military base to monitor in one of their lodges for 10 days. I don't know what happened later.