Section 59(3) of the Defence Act 42 of 2002 operates by force of law, not administrative decision, once its jurisdictional requirements are satisfied: (i) a member absents himself/herself from official duty; (ii) without permission of commanding officer; and (iii) for a period exceeding 30 days. 'Absenting from official duty' is a volitional act requiring the member to leave or not attend the appointed place of duty when required to be there - it includes refusing to perform assigned duties even when physically present at the base. Section 59(3) is a self-standing provision not subject to s 103(1) board of inquiry requirements, and must be interpreted to promote s 200(1) of the Constitution requiring the SANDF to be structured and managed as a disciplined military force. As dismissal under s 59(3) occurs by operation of law when the jurisdictional requirements are met, there is no right to a hearing beforehand. The Biowatch costs principle applies to prevent costs orders against parties seeking to enforce fundamental constitutional rights in non-frivolous litigation.