Ironically, these were mostly the same thing during the space race. I watched a USAF training video on re-entry mechanics[0] a while back that really drives this home in an almost dizzying context switch. It goes from the mechanics of delivering a thermonuclear payload in one sentence, to returning humans to earth in the next.

[0]: https://www.youtube.com/watch?v=c_bkY7-9c8s