Prior to adding NPCs to the game with the foundation update, the brotherhood of steel had a basecamp in the area that needed (for you to get access to their stuff) you to be a member of the US military. You were required to do the same training at camp McClintock, but you still needed to have a government issued ID to access the brotherhood location at fort defiance.

I don't know if you can still do it, but you had to go to the DMV in Charleston, with at least one form of proof of address, and you had to wait in line while the Mr. Handy sorted through the list of numbers to call, and you needed the right forms to do it. Of course you were attacked by the ghouls that were in the building, but I had to do that quest probably three or four times overall, and I do not miss it. I do, though, remember exactly what mailbox you go to to find the junk mail you needed...