Соответствующая норма
Practice Relating to Rule 139. Respect for International Humanitarian Law
Section A. General
Nigeria’s Operational Code of Conduct (1967) tells troops: “We are in honor bound to observe the rules of the Geneva Convention in whatever action you will be taking against the rebel.” 
Nigeria, Operational Code of Conduct for Nigerian Armed Forces, Federal Military Government of Nigeria, July 1967, § 3.