Is there a list of Motorcycle clubs banned from post, or a list of clubs not to join as a SM? Can I wear my club vest on post?
The only real regulations that cover this sort of thing is 600-20 that talk about extremist groups. Traditional MC, while nothing official in by laws, are segregated. This could be enough for commanders to step in and make life difficult for you.
http://rcvsmc.net/id2.html

The intent of this section is to give you an overview of the structure and philosophy of the traditional motorcycle club (MC). This does not necessarily express the feelings or priorities of any particular club, as all motorcycle clubs differ on some points. Regardless of the basic philosophy of this group, it is important that you understand the perspectives of other clubs that you may be associating with from time to time.
https://www.usmvmc.org/

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