[MrB]

Carter was never a nuclear engineer.

Not serving on a nuclear submarine does not mean that he did not have a BS in nuclear engineering.

[wideawake]

Not serving on a nuclear submarine does not mean that he did not have a BS in nuclear engineering.

But the fact that he does not have a BS in nuclear engineering does mean that he does not have a BS in nuclear engineering.

He had a BS in engineering and took some graduate-level courses related to nuclear engineering before he dropped out of grad school, but he is not a nuclear engineer.