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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 V : Medical transport - Art. 18.
Art. 18. Aircraft used as means of medical transport shall enjoy the protection of the Convention during the period in which they are reserved exclusively for the evacuation of wounded and sick and the transport of medical personnel and material.
They shall be painted white and shall bear, clearly marked, the distinctive emblem prescribed in Article 19
, side by side with their national colours, on their lower and upper surfaces.
In the absence of special and express permission, flying over the firing line, and over the zone situated in front of clearing or dressing stations, and generally over all enemy territory or territory occupied by the enemy, is prohibited.
Medical aircraft shall obey every summons to land.
In the event of a landing thus imposed, or of an involuntary landing in enemy territory and territory occupied by the enemy, the wounded and sick, as well as the medical personnel and material, including the aircraft, shall enjoy the privileges of the present Convention.
The pilot, mechanics and wireless telegraph operators captured shall be sent back, on condition that they shall be employed until the close of hostilities in the medical service only.