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Annex I (to Protocol Additional I to the Geneva Conventions of 1949) : Regulations concerning identification, 6 June 1977
Shape and nature
-- Shape and nature
1. The distinctive emblem (red on a white ground) shall be as large as appropriate under the circumstances. For the shapes of the cross, the crescent or the lion and sun, the High Contracting Parties may be guided by the models shown in Figure 2.
2. At night or when visibility is reduced, the distinctive emblem may be lighted or illuminated; it may also be made of materials rendering it recognizable by technical means of detection.
Fig.2 : Distinctive emblems in red on a white ground
Commentary of 1987