I must say I had no clue what the yellow ribbon program was until you brought it up. I will have to check for you and get back to you on this.
As for vets, some of my closest friends at Haas are vets, so I'll also ping them to see what sort of advice they would give you in terms of "Why should a vet pick Haas if he/she can get drastically reduced tuition elsewhere?".
For Vet (US) presence, it's roughly around 2%, so ~5 people per class. They are trying to increase the numbers and some vets have formed the Vet Club last year, so there is attention directed in that area.
Stay tuned and ping me again if I don't respond by the end of the week.