Related Rule
Belgium
Practice Relating to Rule 22. The Principle of Precautions against the Effects of Attacks
The Report on the Practice of Belgium states:
No practice was found concerning the protection of the civilian population against the effects of attacks in the Belgian military regulations” and refers to two internal regulations that “reveal a lack of concern for this issue. 
Report on the Practice of Belgium, 1997, Chapter 1.7, referring to Règlement sur le Peloton Antichar Striker, Règlement G 294, Ministère de la Défense Nationale, Etat-Major Général, Force Terrestre, Ecole des Troupes Blindées, 1986 and Le Peloton de Voltigeurs, Règlement G 293, Ministère de la Défense Nationale, Etat-Major Général, Force Terrestre, Ecole des Troupes Blindées, 1991.
Upon ratification of the 1977 Additional Protocol I, Belgium declared:
In view of the travaux préparatoires … “feasible precautions” [are] those that can be taken in the circumstances prevailing at the moment, which include military considerations as much as humanitarian ones. 
Belgium, Interpretative declarations made upon ratification of the 1977 Additional Protocol I, 20 May 1986, § 3.