; and (2) under the authority, direction, and control of the Director while serving in such position. (d) Designation of primary center (1) In general Each regional medical hub established under subsection (a) shall include a major military medical center designated by the Secretary to serve as the primary center for the provision of specialized medical services in that region. (2) Capabilities A major military medical center may not be designated under paragraph (1) unless the center— (A) includes one or more large graduate medical education training platforms