Nope, you are right. He was an officer on board the USS Pomfret (a diesel sub) and was training to be chief engineer on one of the new nuclear subs, but resigned his commission when his father suddenly died.
How about that. The “fact” that he was a sub Captain was just another media fabrication. I have believed that since I was a child and he was President.
Me too, until another FReeper set me straight.