Wow! Thanks a ton.

I may not understand the one about whether a fleet ballistic missile (FBM) submarine can be retrofitted for a nuclear payload.

It sounds like your grandfather was operating submarines that could launch nuclear bombs! Wow, that is a hefty responsibility. I am sure they favor only the highly skilled for this position.

Interesting to hear his take on LFTRs and how the technology is still in its infancy. I hope the general distaste of the word "nuclear" does not cause the potential of this energy source to be overlooked.