Navy Vet here too and I have wanted to use USAA for so long. All I ever heard was how great they are but every time I tried to get a quote for anything from them, it was always considerably higher than anyone else. I've been with State Farm for a few years now, I think it's time to shop around.
I have no clue but I believe Federal regulations require them to keep enough for 10 years from last production date. So they should be able to supply until 2030.
I have a Gen 1 motor with 35k miles and it doesn't drink any oil.
I really like the idea of the blank plate and having it be your build name or something like that. Hell, even if you do the chassis number 95% of the people, and I'm being generous, won't notice it's not the correct font lol