They suffered a lot during the war with Tsimshian in terms of casualties and dilution of talent when the Rangers had their best removed to form the core of the Salish Defense Force.
Also, just the be clear, these are the groups actually identified in existing material. Some has been clarified, but for the most part they are as presented in the source material. There's nothing precluding the existence of elite Salish Rangers or SDF units, but none have been identified as of yet. That said, who can say? The Salish will probably be mentioned to some extent in Seattle Sprawl.