I need help about supply.
Just a little and dumb question, about this screen (Korean war) :

What are these numbers in the little circles ? I think that is the supply capacity, of course, but why 6, or 8 or 12 ? Why some circles have 2 colors (red and white), an others one only (white) ? how can i use this information ?
I can't found informations about it in the PDF manual.


