Соответствующая норма
Nigeria
Practice Relating to Rule 70. Weapons of a Nature to Cause Superfluous Injury or Unnecessary Suffering
Nigeria’s Military Manual (1994) states that it is prohibited “to employ arms, projectiles or material aimed at causing unnecessary suffering”. 
Nigeria, International Humanitarian Law (IHL), Directorate of Legal Services, Nigerian Army, 1994, pp. 39-40, § 5(l)(iv).
The manual further states:
The basic principles are that every commander has the right to choose the means and methods of the type of warfare to be executed, to avoid unnecessary suffering and damage to men and material. … The principle of avoiding unnecessary suffering and damage prohibits all forms of violence that are not required for the over-powering of the enemy. 
Nigeria, International Humanitarian Law (IHL), Directorate of Legal Services, Nigerian Army, 1994, p. 42, § 11.
Nigeria’s Manual on the Laws of Wars states: “It is expressly forbidden to use arms, projectiles or materials calculated to cause unnecessary suffering.” 
Nigeria, The Laws of War, by Lt. Col. L. Ode PSC, Nigerian Army, Lagos, undated, § 11.
Nigeria’s Soldier’s Code of Conduct provides that it is prohibited “to employ arms, projectiles or material aimed at causing unnecessary suffering”. 
Nigeria, Code of Conduct for Combatants, “The Soldier’s Rules”, Nigerian Army, undated, § 12(e).