The Apollo stowage lists show that each mission had exactly one slide rule "on crew" (i.e. in somebody's spacesuit) at launch. Who carried the slide rule? Was it always the same role (CDR, CMP, LMP), or did the crew decide among themselves who would carry it?
Here is a snippet of Apollo 11's stowage manifest:
This answer claims that both Armstrong and Aldrin had slide rules, but that does not fit the official stowage manifest. Any such claim of more than one slide rule per mission should be supported by proper sources.
Update: I'm principally interested in the government-furnished sliderules. It's possible that some astronauts brought their own model as a personal preference item; such answers are acceptable, but if possible should indicate that they were personal items.