Related Rule
New Zealand
Practice Relating to Rule 17. Choice of Means and Methods of Warfare
New Zealand’s Military Manual (1992) states:
Those who plan or decide upon an attack shall … take all feasible precautions in the choice of means and methods of attack with a view to avoiding, and in any event to minimizing, incidental loss of civilian life, injury to civilians and damage to civilian objects. 
New Zealand, Interim Law of Armed Conflict Manual, DM 112, New Zealand Defence Force, Headquarters, Directorate of Legal Services, Wellington, November 1992, § 518(1).