Art 24. Hospital ships utilized by National Red Cross Societies, by officially recognized relief societies or by private persons shall have the same protection as military hospital ships and shall be exempt from capture, if the Party to the conflict on which they depend has given them an official commission and in so far as the provisions of Article 22 concerning notification have been complied with. These ships must be provided with certificates from the responsible authorities, stating that the vessels have been under their control while fitting out and on departure.