Ohio-class knock-off ?
Submarines are historically referred to as boats. Is the Jimmy Carter a special case?
The other thing I note is the starting sentences with coordinating conjunctions. Perhaps the Chicago Manual of Style says it's OK, but I had been taught to use an appropriate conjunctive adverb instead.
It's just some stupid thing that I always notice when I see a sentence start with "And" or "But", not that it has anything to do with anything important here, or that what I was taught matters, or that I am "right".
It just seems really informal to me.
Did other Soviet subs have a pair, or is this the only one?