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Nigeria
Practice Relating to Rule 139. Respect for International Humanitarian Law
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.
Nigeria’s Operational Code of Conduct (1967) directs “all officers and men to observe strictly the following rules during operations. (These instructions must be read in conjunction with the Geneva Convention.)” It also states: “To be successful in our tasks as soldiers these rules must be carefully observed. I will not be proud of any member of the Armed Forces under my command who fails to observe them.” 
Nigeria, Operational Code of Conduct for Nigerian Armed Forces, Federal Military Government of Nigeria, July 1967, §§ 4 and 5.