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Chad
Practice Relating to Rule 25. Medical Personnel
Section B. Equipment of medical personnel with light individual weapons
Chad’s Instructor’s Manual (2006) states:
Medical personnel may carry light weapons for their own personal protection. Medical establishments and means of transport may be guarded by a person on guard duty, sentries or an escort, who are not, however, entitled to oppose the capture of the medical establishment or means of transport. They must bear distinctive signs. 
Chad, Droit international humanitaire, Manuel de l’instructeur en vigueur dans les forces armées et de sécurité, Ministère de la Défense, Présidence de la République, Etat-major des Armées, 2006, p. 56.