Norma relacionada
Practice Relating to Rule 108. Mercenaries
Section A. Definition of mercenaries
Chad’s Instructor’s Manual (2006) states:
Mercenaries are people who take part in a conflict for personal gain and who do not belong to the armed forces of a party to the conflict or who have not been sent on an official mission by a country.
They enrol voluntarily in the armed forces of a belligerent State of which they are not nationals. … The use of mercenaries is not prohibited in the current state of international law. 
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. 55; see also p. 42.