https://youtu.be/JyzJcUV_26Q
Who or What was the Mouth of Sauron?
Doesn't matter if US requires it or not, what matters is the International contention on the matter.
Sure, you can travel freely inside the US, but if you want to leave the country YOU are going to need some type of "vaccination passport".
Check out that rock-hard body!
Corporations will require it, especially Music Concerts and Sporting Events. You will need to download their tracking app to enter their venues. I see that happening!