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Belgium
Practice Relating to Rule 16. Target Verification
Belgium’s Teaching Manual for Soldiers considers that an object can be attacked only when it can reasonably be considered to be a military objective and states that armed forces should not shoot first and check later. 
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. 21.