§ 131.9. Immunity for action of military courts or boards. No action
or proceeding shall be prosecuted or maintained against the convening
authority or a member of a military court or board or officer or person
acting under its authority or reviewing its proceedings, on account of
the approval or imposition or execution of any sentence or findings or
the imposition or collection of a fine or penalty, or the execution of
any process or mandate of a military court or board.