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Convention (I) for the Amelioration of the Condition of the Wounded and Sick in Armed Forces in the Field. Geneva, 12 August 1949.
Marking of units of neutral countries
The medical units belonging to neutral countries, which may have been authorized to lend their services to a belligerent under the conditions laid down in Article 27
, shall fly, along with the flag of the Convention, the national flag of that belligerent, wherever the latter makes use of the faculty conferred on him by Article 42
Subject to orders to the contrary by the responsible military authorities, they may, on all occasions, fly their national flag, even if they fall into the hands of the adverse Party.
Commentary of 1952