Apparently, there's a fellow whose job it is to carry the football -- the briefcase containing the code for declaring nuclear war -- wherever the vice president goes. And Joe Biden helpfully pointed him out to the audience while he was busy Trump bashing. See Biden Says Trump Can't Be Trusted With Nuclear Codes, Then Tells Crowd He Has the Codes 'Right Back Here'.
Now that the guy has been outed, is he safe? Will he have to be replaced? Does he get secret service protection, too? He needs it now.
BTW, it's probably a safe bet that Biden either never knew or can't now remember the password should it be necessary to access said football. Not quite as likely, but still in the realm of possibility in light of recent news is that foreign sources have hacked into the nuclear launch system, if it still works.