It's not brain surgery

I've always wondered if rocket scientists ever say "its not brain surgery" and vice versa

Command Module
Service Module
Lunar Excursion Vehicle.
That's what those abbreviations stand for.
The LEV actually consists of two parts--the lunar landing module, which stays behind on the moon, and the lunar excursion module that returns to lunar orbit.
Sincerely,
A space nerd from the 1960s.