((a)) Centers shall be operated under the supervision of the Under Secretary for Health and shall be staffed with personnel qualified to provide the highest quality instruction and training in various medical and health care disciplines.

((b)) As a means of providing appropriate recognition to persons in the career service of the Administration who possess outstanding qualifications in a particular medical or health care discipline, the Under Secretary for Health shall from time to time and for such period as the Under Secretary for Health considers appropriate assign such persons to serve as visiting instructors at Centers.

((c)) Whenever the Under Secretary for Health considers it necessary for the effective conduct of the program provided for under this subchapter, the Under Secretary for Health may contract for the services of highly qualified medical and health personnel from outside the Department to serve as instructors at such Centers.