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Annex I (to Protocol Additional I to the Geneva Conventions of 1949) : Regulations concerning identification, 6 June 1977
-- Optional Use
1. Subject to the provisions of Article 6
of these Regulations, the signals specified in this Chapter for exclusive use by medical units and transports shall not be used for any other purpose. The use of all signals referred to in this Chapter is optional.
2. Temporary medical aircraft which cannot, either for lack of time or because of their characteristics, be marked with the distinctive emblem, may use the distinctive signals authorized in this Chapter. The best method of effective identification and recognition of medical aircraft is, however, the use of a visual signal, either the distinctive emblem or the light signal specified in Article 6
, or both, supplemented by the other signals referred to in Articles 7
of these Regulations.