((a)) ** .—** The proceedings of a selection board convened under section 573, 611, 628, or 20211 of this title may not be disclosed to any person not a member of the board, except as authorized or required to process the report of the board. This prohibition is a statutory exemption from disclosure, as described in .
((b)) ** .—** The discussions and deliberations of a selection board described in subsection (a) and any written or documentary record of such discussions and deliberations—
((1)) are immune from legal process;
((2)) may not be admitted as evidence; and
((3)) may not be used for any purpose in any action, suit, or judicial or administrative proceeding without the consent of the Secretary of the military department concerned.
((c)) ** .—** This section applies to all selection boards convened under section 573, 611, 628, or 20211 of this title, regardless of the date on which the board was convened.