In fact, name, rank, and serial number would be a real brainteaser.
I tell my wife that if she wants me to pick up anything more then two items at the grocery store, she'd better make a list.
My wife stopped letting me go to the grocery store, even with her. I am most certainly banned from Costco. I have the innate capability to spend 100’s yet still forget what she sent me for, and she hates being surprised at what is coming out of the cart at checkout. She says I am worse than a kid.
It’s easier for me to go to the store and make a list of what I forgot.
I’m old enough to have been in the service and issued a real serial number not associated with my Social Security Number.
It’s been burned into my brain forever. So secret you can’t even find it in any of the military online databases I’ve seen. When they switched me over to the SSAN version it just disappeared. But not on the dog tags I have. Very useful; it forms the basis for many passwords I have.