Are non-Indians/Eskimos accepted as health care providers when working for Indian Health Services?

I am a registered nurse with no American Indian lineage. I am interested in working for IHS and I am curious if I would be accepted or resented by the community. I also understand that Indians/Eskimos have preferential hiring. Does that apply to promotion as well, i.e. will I be eligible for promotion and be able to make a career with this organization.