>>>no routine cleaning, fillings, root canals<<<
Not very smart - wait till health threatening before treatment...
2ndDivisionVet is correct though - as many are able to get NONE as services are just not available in all areas.
What I've said is correct for the VA hospital I've been to, and their dental staff consists of oral surgeons and technicians only. No general dentist practitioners.
It's probably an expense consideration. If the VA offered full dental services, that would increase their professional staff and total cost by several billion annually.