Related Rule
Practice Relating to Rule 59. Improper Use of the Distinctive Emblems of the Geneva Conventions
Belgium’s Law of War Manual (1983) provides:
The abuse of the emblem of the Red Cross is strictly prohibited. One may not, therefore, display the emblem of the Red Cross on vehicles that transport troops, ammunition [or] foodstuffs to the frontline … One may not use the emblem of the Red Cross to protect observation posts or military depots. 
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. 33.
Belgium’s Teaching Manual for Officers (1994) stipulates:
It is prohibited to abuse the protective signs provided for by the [1949 Geneva] Conventions and [the 1977 Additional Protocol I]. Example: camouflaging arms and ammunition in a vehicle or a building displaying the protective sign of the red cross. 
Belgium, Droit de la Guerre, Manuel d’Instruction pour Officiers, Etat-Major Général, Division Opérations, 1994, Part I, Title II, p. 33.
Belgium’s Law on the Protection of the Emblem (1956) punishes “without prejudice to other penal provisions, anyone who, in violation of international conventions that regulate their use, uses the designations “Red Cross”, “Geneva Cross”, “Red Crescent”, or “Red Lion and Sun”, or their corresponding signs and emblems”. 
Belgium, Law on the Protection of the Emblem, 1956, Article 1.