(b)
The board shall consist of at least three qualified medical officers or physicians, one of whom is specially qualified in the treatment of mental disorders, appointed from available medical officers or physicians under his jurisdiction by the head of whichever of the following is providing medical treatment for the member, or by a person designated by that head—
(1)
Department of the Army;
(2)
Department of the Navy;
(3)
Department of the Air Force;
(4)
Department of Health and Human Services; or
(5)
Department of Veterans Affairs.
If the hospitalization or medical care of the member is not provided by the United States, the board shall be appointed by the Secretary of the department having jurisdiction of the member.