(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 section
1201 of this title;
(2)
place such member on the temporary disability retired list pursuant to section
1202 of this title; or
(3)
separate such member from an armed force pursuant to section
1203 of this title
by reason of unfitness to perform the duties of his office, grade, rank, or rating unless the determination of the Secretary concerned with respect to unfitness is first approved by the Secretary of Defense on the recommendation of the Assistant Secretary of Defense for Health Affairs.