((a)) The Secretary concerned shall prescribe regulations to carry out this chapter within his department.

((b)) Except as provided in subsection (d), the Secretary concerned has all powers, functions, and duties incident to the determination under this chapter of—

((1)) the fitness for active duty of any member of an armed force under his jurisdiction;

((2)) the percentage of disability of any such member at the time of his separation from active duty;

((3)) the suitability of any member for reappointment, reenlistment, or reentry upon active duty in an armed force under his jurisdiction; and

((4)) the entitlement to, and payment of, disability severance pay to any member of an armed force under his jurisdiction.

((c)) The Secretary concerned or the Secretary of Veterans Affairs, as prescribed by the President, has the powers, functions, and duties under this chapter incident to hospitalization, reexaminations, and the payment of disability retired pay within his department or agency.

((d)) The Secretary concerned may not, with respect to any member who is a general officer or flag officer or is a medical officer being processed for retirement under any provisions of this title by reason of age or length of service—

((1)) retire such member under ;

((2)) place such member on the temporary disability retired list pursuant to ; or

((3)) separate such member from an armed force pursuant to