On Ancestry.com, there is something new for NC men who registered, that were born after Feb 17 1897 and before 31 Dec 1921. I believe this was called the 'old men's registration'.
It gives information such as the person's name and address who would ALWAYS know how to find the registrant, employers name and address. I found it to be intersting, because the lady's name, when I searched for her in particular, seems to be on many different mens registration cards, in the same area and if I go by surname, she was related to only one. I need to look further into this. It might mean something more.