Fort Bragg is huge. Just because you were there doesn't mean you ever met anyone else in particular who was also there. I'm pretty sure the base in Afghanistan they're talking about (they never mention it by name) is so huge and central to the US logistics in that country that if you were in the military in Afghanistan anytime in the last 20+ years, you were almost certainly stationed there for at least some time. It's just grasping at straws trying to ascribe meaning to what are, in practice, overly elaborate suicide attempts to garner attention.
It's public knowledge, for those ego both can and will read, that most of the federal good reserve has been in vaults in New York (the financial center of the country) since the 70s. Musk is just a moron.