You’d be surprised. I did a FOIA request for my military records once just to see what they had. Every written order I had received as well as many official forms I’d filled out going back to and including when I was an ROTC cadet were in the 2 inch thick packet I received back. I only served 3 years.
They don't know him from Adam's housecat.
He was in the Reserves for 10 years.