On a serious note though, we probably don’t remember how to go to the moon. I mean the gritty details not the first principles.

Organizations are really just people, who when are gone, if they have not trained a successor, their expertise just goes with them.

On the other hand, if you wanted to go to the moon today, you wouldn't do it the same way they did for Apollo, so not every gritty detail is useful any more. Hand-weaving guidance computer core rope memory, for example, is probably a forgotten skill, but you wouldn't use core rope memory today, and even if you did, it would probably not be woven by hand. And even if you did use it and you did weave it by hand, materials and technology is better and smaller now so you still would not build it in the same way.

Or perhaps intricate multi-step machining processes using experts on machines not made for 50 years that these days would be a fairly ordinary 5-axis milling job.

while that's a pity, i am not terribly worried. we managed it once without previous experience, so we can manage it again. in fact the less we rely on past experience the more we develop the capacity to do difficult things without prior experience. (that sounds like a contradiction in terms, but i hope it makes sense. it's kind of like linux from scratch. or the learning benefits from reinventing the wheel. instead of improving how to travel to the moon we improve the process of how to develop moon travel)