Okay, here’s the link to the PBEM web-page. It has PBEM rules and a chart where you can roll to see what Partisan Card you draw (it’s explained in the rules):
http://members.aol.com/evilhedpro/fa/fapbem.htm
The link to the map is here, though I haven’t yet figured out how it works:
http://www.taulbee.us/webfa/
This is a link to the OOB Rules (a rough copy):
http://www.hasbro.com/common/instruct/Fortress_America.pdf
Here is a link to the Fortress America Players Association (who knew?):
http://games.groups.yahoo.com/group/fapagroup/
They appear to be the source of the map.
And, finally, here’s a really cool high-res picture of the game:
http://www.visi.com/~spookshow/famerica.html
If anyone can figure out how the map works, let me know. I suggest contacting the FAPA folks since they apparently originated the map. Unless someone has a better idea, I think it would be cool to bid to play America. We could assign values to the pieces to determine who wins the bid. Say 6 for a Hovertank, 8 for a Helicopter, 15 for a bomber, etc.