I Can Never Promote Anyone

[McHub532]

From the very beginning (On my third Campaign now) I've never had the option to promote or rank advance anyone. There is always a "You've reached your limit, blah blah" in the tab box for Rank after each mission.

Do I have to pull off higher ranked sailors if I want to promote someone of a lower rank?

I'm worried all my new sailors are going to organize a mutiny if I never give them promotions.