"We keep what we have only with vigilance, and just as freedom for the individual comes from the Twelve Steps, so freedom for the group springs from our Traditions.
I am just doing what I have been taught, remaining vigilant.
If it says NA on it it belongs to the members of Narcotics Anonymous.
If it doesn't then it's an affiliation or an outside interest.
read the traditions, discuss them at meetings.
The hard won experience it speaks of in the postamble speaks to the pioneers in AA that fought to keep their unity. None of us might have had the opportunity to recover if they had strayed from their primary purpose in the 5th tradition.