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Annex I (to Protocol Additional I to the Geneva Conventions of 1949) : Regulations concerning identification, 6 June 1977
-- Electronic identification
1. The Secondary Surveillance Radar (SSR) system, as specified in Annex 10 to the Chicago Convention on International Civil Aviation of 7 December 1944, as amended from time to time, may be used to identify and to follow the course of medical aircraft. The SSR mode and code to be reserved for the exclusive use of medical aircraft shall be established by the High Contracting Parties, the Parties to a conflict, or one of the Parties to a conflict, acting in agreement or alone, in accordance with procedures to be recommended by the International Civil Aviation Organization.
2. Parties to a conflict may, by special agreement between them, establish for their use a similar electronic system for the identification of medical vehicles, and medical ships and craft.
Commentary of 1987