(a) Subject to the provisions of subsections (d) and (e), in filling a position within any Executive agency, the head of such agency may give preference to any employee of such agency, or any other Executive agency, to transfer to a position of the same status and tenure as the position of such employee on the date of applying for a transfer under subsection (b) if—
An employee whose application for transfer is rejected under the provisions of subsection (c) may request the head of such agency to review the rejection. Such request for review shall be submitted to the head of the agency within 30 days after the employee receives notification under subsection (c). Within 30 days after receiving a request for review, the head of the agency shall complete the review and provide a written statement of findings to the employee and the Merit Systems Protection Board.
(e) The provisions of subsection (a) shall apply with regard to any employee—
no later than 18 months after such a determination is made by the Merit Systems Protection Board.