I am a retired Army veteran. What uniform am I authorized to wear to my son’s Bootcamp graduation?

While you are authorized to wear Class As, I think you should wear the uniform you have earned with that retirement, Khaki pants with a polo shirt. I view this like a wedding, you don't want your appearance to take away from the Brides, so for his graduation you don't want to take away from his friends and him. Additionally, you will relieve a lot of anxiety from those young troops while they try and figure out whether they need to salute the guy with the Retired Patch on the sleeve of his uniform.

I'd suggest Class Bs. That's what we wore for our summer OSUT graduation, anyway. No one will have a problem with a retiree wearing a different uniform than everyone else.

Wear Class B's if it's going to be that hot and you want to wear a uniform.