Related Rule
South Africa
Practice Relating to Rule 3. Definition of Combatants
South Africa’s LOAC Manual (1996) defines combatants as “any member of the armed forces, except medical personnel and religious personnel”. 
South Africa, Presentation on the South African Approach to International Humanitarian Law, Appendix A, Chapter 4: International Humanitarian Law (The Law of Armed Conflict), National Defence Force, 1996, § 24(a). This manual is also included in Chapter 4 of the Draft Civic Education Manual of 1997.
South Africa’s Revised Civic Education Manual (2004) states:
Combatants. This term refers to any member of the armed forces, except medical personnel and religious personnel. Combatants are usually recognised by the wearing of uniforms or other distinctive marking. They must also be part of an organisation with a clear command structure. 
South Africa, Revised Civic Education Manual, South African National Defence Force, 2004, Chapter 4, § 47(a).
[emphasis in original]