Related Rule
Practice Relating to Rule 8. Definition of Military Objectives
Section C. Places where armed forces or their materiel are located
Belgium’s Teaching Manual for Soldiers considers that “all objects occupied or used by enemy military forces (positions, barracks, depots, etc.)” are military objectives. 
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. 20.
Belgium’s Law of War Manual (1983) considers that “the army, its positions, provision of its supplies, its stores, workshops, arsenals, depots, defence works, … war buildings, etc.” are military objectives. 
Belgium, Droit Pénal et Disciplinaire Militaire et Droit de la Guerre, Deuxième Partie, Droit de la Guerre, Ecole Royale Militaire, par J. Maes, Chargé de cours, Avocat-général près la Cour Militaire, D/1983/1187/029, 1983, p. 26.