Related Rule
New Zealand
Practice Relating to Rule 54. Attacks against Objects Indispensable to the Survival of the Civilian Population
Section B. Attacks against objects used to sustain or support the adverse party
New Zealand’s Military Manual (1992) provides that the prohibition to attack, destroy, remove or render useless objects indispensable to the survival of the civilian population
shall not apply to such of the objects covered by it as are used by an adverse Party:
a. as sustenance solely for the members of its armed forces; or
b. if not as sustenance, then in direct support of military action, provided, however, that in no event shall actions against these objects be taken which may be expected to leave the civilian population with such inadequate food or water as to cause its starvation or force its movement. 
New Zealand, Interim Law of Armed Conflict Manual, DM 112, New Zealand Defence Force, Headquarters, Directorate of Legal Services, Wellington, November 1992, §§ 504(3) (land warfare) and 613(3) (air warfare).