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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. 21.
Art. 21. The personnel protected in pursuance of Articles 9 (paragaph 1)
, shall wear, affixed to the left arm, an armlet bearing the distinctive sign, issued and stamped by military authority.
The personnel mentioned in Article 9, paragraphs 1 and 2
, shall be provided with a certificate of identity, consisting either of an entry in their small book (paybook) or a special document.
The persons mentioned in Articles 10
who have no military uniform shall be furnished by the competent military authority with a certificate of identity with photograph, certifying their status as medical personnel.
The certificates of identity shall be uniform and of the same pattern in each army.
In no case may the medical personnel be deprived of their armlets or the certificates of identity belonging to them.
In case of loss they have the right to obtain duplicates.