We are left to assume that they all died, even though it never directly says that ALL of them die (to my recollection). If they had survived I am certain there would have been at least a passing mention of them in some way, even if it was just to join Marco on Letterman. History tends to immortalize its strongest warriors, and while the Animorphs obviously would get the bulk of the glory, I have to imagine that the auxilaries would have been recognized as well.
There was a lot that could have been done with that group, but alas it was not meant to be. They all perished to help promote Applegates message of what war is like.