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Annex I (to Protocol Additional I to the Geneva Conventions of 1949) : Regulations concerning identification, 6 June 1977
1. The distinctive emblem shall, whenever possible, be displayed on a flat surface or on flags visible from as many directions and from as far away as possible.
2. Subject to the instructions of the competent authority, medical and religious personnel carrying out their duties in the battle area shall, as far as possible, wear headgear and clothing bearing the distinctive emblem.
Commentary of 1987