I would add a 'no affiliation' option...but the idea is to eventually have all active members herded into one group or another. In the old pirate/ninja style, the "no affiliation" option was being a homo...in an attempt to get people to actually choose one side or another. If I give people the option to not choose a side, I'm afraid that too many people will exercise that right and it will dilute the rivalries.
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