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Djibouti
Practice Relating to Rule 14. Proportionality in Attack
Djibouti’s Manual on International Humanitarian Law (2004) states that IHL “has several principles [one of which is] … proportionality: the damage caused to the civilian population and civilian objects may not be excessive in relation to the direct advantage anticipated from the military operation”. 
Djibouti, Manuel sur le droit international humanitaire et les droits de l’homme applicables au travail du policier, Ministère de l’Intérieur, Direction Générale de la Police, 2004, p. 11.
In 2010, in the History and Geography Textbook for 8th Grade, Djibouti’s Ministry of National Education and Higher Education stated:
[T]he principle of proportionality aims to find a balance between two conflicting interests in situations where rights and prohibitions are not absolute: one interest is dictated by considerations of military necessity, the other one by requirements of humanity. 
Djibouti, Ministry of National Education and Higher Education, History and Geography Textbook for 8th Grade, 2010, p. 188.