Crew management, explaination

[fullmetaledges]

Originally Posted by Banquet

While on the subject of crew management.. after filling up my damage team with zero renown recruits I notice during the patrol they get an up arrow saying they've been promoted. They're no longer called recruits but are given another title. They seem to get specialties assigned (some become quite good!) When I get back to port I have a few promotions listed but when I drag them across the screen I get a message saying nobody has been promoted so I can't continue.. Does anyone know what that means?

I would also like this answered but I think that because it doesn't say anywhere that nobody else knows either.