Règle correspondante
Sweden
Practice Relating to Rule 29. Medical Transports
Sweden’s IHL Manual (1991) considers that Article 21 of the 1977 Additional Protocol I on the protection of medical vehicles has the status of customary law. 
Sweden, International Humanitarian Law in Armed Conflict, with reference to the Swedish Total Defence System, Swedish Ministry of Defence, January 1991, Section 2.2.3, p. 18.
Sweden’s IHL Manual (1991) states that Articles 25–27 of the 1977 Additional Protocol I on the protection of medical aircraft have the status of customary law. 
Sweden, International Humanitarian Law in Armed Conflict, with reference to the Swedish Total Defence System, Swedish Ministry of Defence, January 1991, Section 2.2.3, p. 18.