Tex. Gov't Code § 432.186

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