Crew sizes

I've noted that the new FB gives crew sizes, from the discussion from 
the folks on the other side of the pond who have the books.  I was 
wondering, in rough terms, how large a crew would likely be present on 
a 'small' (by space station standards) refuelling station--minimal 
weaponry, maybe the size of a light carrier or so.  And how many of 
that would normally be Marines?

John