Kwilson, I think membership to the group just entails you can present the groups info to prospective home-owners in attempts to bolster your chances of hunting on their property. I don't think they have a list of properties you can hunt on per say. Many home-owners in Northen Virginia are just going to flat out say no to you hunting on their property. We have talked before and if you have nothing else going on, I will be more than happy to show you around and provide you with the ins and outs of hunting on Quantico Marine Base. It would be my pleasure.
Another place I would suggest hunting would be Fort Belvoir. Although I have never hunted there, it is bow only all year and has early and late season doe hunting, making the season a total of 6 months long! You can't beat it. Best of luck to you. Here is the link to Belvoir Hunting.
http://belvoirbowhunters.com/
Brett