I don't know if it's a socio-cultural thing, but "TS Vets" initially made me wonder why someone had set up a niche group for TS animal doctors - before latterly thinking "Perhaps they mean TS Veterans" - which turns out to be the case. For fairly obvious reasons you have to be a TS or IS veteran to join the group or see messages, but if that message history table at the bottom of the linked to page is anything to go by, it's been running for an impressive period of time.