Related Rule
Switzerland
Practice Relating to Rule 88. Non-Discrimination
Section B. Civilians
Switzerland’s Basic Military Manual (1987) provides:
All civilian persons shall benefit from an equal treatment. No one can be disadvantaged because of race, colour, language, religion, political or other opinions, social origin, faith, sex, wealth or any other circumstance. 
Switzerland, Lois et coutumes de la guerre (Extrait et commentaire), Règlement 51.7/II f, Armée Suisse, 1987, Article 148.
Switzerland’s Regulation on Legal Bases for Conduct during an Engagement (2005) states:
Foreign civilians or civilians of an adverse party to a conflict are specifically protected under the law of armed conflict. If they are in the hands of a military unit, they must at all times be treated humanely. Any act of torture, physical or mental ill-treatment, degrading treatment or discrimination as well as measures of reprisal are prohibited. 
Switzerland, Bases légales du comportement à l’engagement (BCE), Règlement 51.007/IVf, Swiss Army, issued based on Article 10 of the Ordinance on the Organization of the Federal Department for Defence, Civil Protection and Sports of 7 March 2003, entry into force on 1 July 2005, § 198.
[emphasis in original]