Related Rule
Practice Relating to Rule 142. Instruction in International Humanitarian Law within Armed Forces
Section B. Obligation of commanders to instruct the armed forces under their command
Belgium’s LOAC Teaching Directive (1996) states:
Each commander is responsible for ensuring that the personnel placed under his authority have sufficient knowledge of their obligations [under the law of armed conflict] and that they have … received appropriate instruction and training. 
Belgium, Directive sur l’enseignement du droit des conflits armés et des règles d’engagement au sein des Forces Armées belges, Ordre Général J/185, Forces Armées, Etat-Major Général, Division Opérations, 8 February 1996, Section 1.
Belgium’s Teaching Manual for Soldiers states: “Every soldier must know the essential rules of the law of war … and their meaning in order to be able to apply them. The command must ensure this knowledge by means of an appropriate instruction.” 
Belgium, Droit de la Guerre, Dossier d’Instruction pour Soldat, à l’attention des officiers instructeurs, JS3, Etat-Major Général, Forces Armées belges, undated, p. 1.