The Secretary amends the definition of "reservation" under the regulations governing the American Indian Vocational Rehabilitation Services (AIVRS) program to conform to the Department's current interpretation and practices. "Reservation" means Federal or State Indian reservations; public domain Indian allotments; former Indian reservations in Oklahoma; land held by incorporated Native groups, regional corporations, and village corporations under the provisions of the Alaska Native Claims Settlement Act; and defined areas of land recognized by a State or the Federal Government where there is a concentration of tribal members and on which the tribal government is providing structured activities and services.