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Convention (II) for the Amelioration of the Condition of Wounded, Sick and Shipwrecked Members of Armed Forces at Sea. Geneva, 12 August 1949.
Limitation in the use of markings
The distinguishing signs referred to in Article 43
can only be used, whether in time of peace or war, for indicating or protecting the ships therein mentioned, except as may be provided in any other international Convention or by agreement between all the Parties to the conflict concerned.
Commentary of 1960