Iowa Code § 29B.125: Immunity for action of military courts.

An accused shall not bring an action or proceeding against the convening authority or a member of a military court or board convened under this code or a person acting under its authority or reviewing its proceedings because of the approval, imposition, or execution of any sentence or the imposition or collection of a fine or penalty, or the execution of any process or mandate of a military court or board convened under this code.