Now I know why I haven't heard of AFM in either WV or NC. They are 100 miles or more from where I am active. Then too, in neither locale where I am is BRASS a mainstay of music.
My overview is that if one is NOT wholly seeking their entire living in music, participating in a musical union / organization is mostly supporting those who are.
Personally, the circumstances of my life have passed when I was able, but truly I never aspired to earn a living doing such ... I just enjoy playing my brass instruments as much as I can for the short time that I'll still be able to.