> I've wondered what my county's response would be if I borrowed one of our SCBAs (self-contained breathing apparatus) to wear to an anti-ICE demo or ICE observation incident

Give it a try and see what happens? Get your friends and colleagues with you too! In Europe (at least France and Spain) we have firefighters participating in protests, some of them not so non-violent, and there been clashes between firefighters and police (so unexpected) in the past, most recently just ~a week ago: https://www.albawaba.com/news/firefighter-protest-lille-esca....

I guess there is many reasons AFAB isn't an acronym people usually spread, can't think of any time firefighters generally been against the people.