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Convention for the Amelioration of the Condition of the Wounded and Sick in Armies in the Field. Geneva, 27 July 1929.
Chapter VI : The distinctive emblem - Art. 23.
Art. 23. The medical units belonging to neutral countries which shall have been authorized to lend their services under the conditions laid down in Article 11
, shall fly, along with the flag of the Convention, the national flag of the belligerent to whose army they are attached.
They shall also have the right, so long as they shall lend their services to a belligerent, to fly their national flag.
The provisions of the second paragraph of the preceding article
are applicable to them.