Related Rule
Cameroon
Practice Relating to Rule 29. Medical Transports
Section C. Respect for and protection of hospital ships
Cameroon’s Instructor’s Manual (2006) states:
352.2 – Special protection: (persons and objects specially protected.)
Certain categories of persons and objects benefit from special protection under the law of armed conflict and international humanitarian law both in the civilian domain and in the military domain.
352.20 Military medical services
Hospital ships (measuring more than 2000 gross tonnes) are charged with providing assistance to the victims of war [and are specially protected]. 
Cameroon, Droit des conflits armés et droit international humanitaire, Manuel de l’instructeur en vigueur dans les forces de défense, Ministère de la Défense, Présidence de la République, Etat-major des Armées, 2006, p. 92, § 352.2 and p. 93, § 352.20; see also p. 135, § 412.20.
The manual also states: “The medical personnel on hospital ships (as well as their equipment) must not be captured during the entire time that they are in service on these ships.” 
Cameroon, Droit des conflits armés et droit international humanitaire, Manuel de l’instructeur en vigueur dans les forces de défense, Ministère de la Défense, Présidence de la République, Etat-major des Armées, 2006, p. 122, § 403; see also p. 123, § 403 and p. 165, § 463.