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Belgium
Practice Relating to Rule 1. The Principle of Distinction between Civilians and Combatants
Section B. Attacks against combatants
Belgium’s Teaching Manual for Soldiers states that only enemy combatants may be attacked. 
Belgium, Droit de la Guerre, Dossier d’Instruction pour Soldat, à l’attention des officiers instructeurs, JS3, Etat-Major Général, Forces Armées belges (undated), pp. 7, 10, 14 and 41.