The Veterans Health Administration shall include the following:
((1)) The Office of the Under Secretary for Health.
((2)) A Medical Service.
((3)) A Dental Service.
((4)) A Podiatric Service.
((5)) An Optometric Service.
((6)) A Nursing Service.
((7)) A Readjustment Counseling Service.
((8)) Such other professional and auxiliary services as the Secretary may find to be necessary to carry out the functions of the Administration.