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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.
Annex I : Draft agreement relating to hospital zones and localities - Obligations
Hospital zones shall be subject to the following obligations:
(a) The lines of communication and means of transport which they possess shall not be used for the transport of military personnel or material, even in transit.
(b) They shall in no case be defended by military means.
Commentary of 1952