In 1986 this program split into two departments: the Navajo Nation Archaeology Department (NNAD), which provides archaeological field services, and the Navajo Nation Historic Preservation Department (NNHPD), the designated Tribal Historic Preservation Office, which reviews, provides permits, and "grants clearance" for projects on the Navajo reservation (as opposed to the State Historic Preservation Offices of Arizona, New Mexico, and Utah).
The point being if we were such a great program, then more Navajo students should be in top positions within the Navajo Nation Archaeology Department (NNAD) and the Navajo Nation Historic Preservation Department (NNHPD) by now.