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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.
Conditions not depriving hospital ships of protection
The following conditions shall not be considered as depriving hospital ships or sick-bays of vessels of the protection due to them:
(1) The fact that the crews of ships or sick-bays are armed for the maintenance of order, for their own defence or that of the sick and wounded.
(2) The presence on board of apparatus exclusively intended to facilitate navigation or communication.
(3) The discovery on board hospital ships or in sick-bays of portable arms and ammunition taken from the wounded, sick and shipwrecked and not yet handed to the proper service.
(4) The fact that the humanitarian activities of hospital ships and sick-bays of vessels or of the crews extend to the care of wounded, sick or shipwrecked civilians.
(5) The transport of equipment and of personnel intended exclusively for medical duties, over and above the normal requirements.
Commentary of 1960