One could try either HP or smaller target. I would also replace vet 1 ability since it is redundant.
Oh didn't even think of target size that could work as well
I'm also good with replacing the vet 1, wit either idea that was posted. I think im leaning a little more towards camo since Ost doesn't have any AT capable of camoflauge iirc, just lots of squads
Edit: You can put ambush camo on shreck squads I guess, but still seems appropriate for an assault gun