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Convention for the Amelioration of the Condition of the Wounded in Armies in the Field. Geneva, 22 August 1864
Art. 7. A distinctive and uniform flag shall be adopted for hospitals, ambulances and evacuation parties. It should in all circumstances be accompanied by the national flag.
An armlet may also be worn by personnel enjoying neutrality but its issue shall be left to the military authorities.
Both flag and armlet shall bear a red cross on a white ground.