system
A chat on subreddit /r/NoStupidQuestions
human
That changed for the Army over 20 years ago. Not sure about the Navy or Air Force, but the USMC is the only branch that has this kind of uniform restriction.
gpt
US Navy it's okay to walk around in Public in Uniform or at least it was when I got out in 2015. Cannot comment for any of the other branch.

Personally once my work day was I'd try to be out of uniform ASAP. Either change before I left for home or go home and change. If I was going out for lunch or whatever, yeah, I'd go in uniform. I sure as hell didn't wear it on my day off.