Article 19.
The protection to which civilian hospitals are entitled shall not cease unless they are used to commit, outside their humanitarian duties, acts harmful to the enemy. Protection may, however, cease only after due warning has been given, naming, in all appropriate cases, a reasonable time limit and after such warning has remained unheeded.

The fact that sick or wounded members of the armed forces are nursed in these hospitals, or the presence of small arms and ammunition taken from such combatants and not yet been handed to the proper service, shall not be considered to be acts harmful to the enemy.

Article 20.
Persons regularly and solely engaged in the operation and administration of civilian hospitals, including the personnel engaged in the search for, removal and transporting of and caring for wounded and sick civilians, the infirm and maternity cases shall be respected and protected.

In occupied territory and in zones of military operations, the above personnel shall be recognizable by means of an identity card certifying their status, bearing the photograph of the holder and embossed with the stamp of the responsible authority, and also by means of a stamped, water-resistant armlet which they shall wear on the left arm while carrying out their duties. This armlet shall be issued by the State and shall bear the emblem provided for in Article 38 of the Geneva Convention for the Amelioration of the Condition of the Wounded and Sick in Armed Forces in the Field of 12 August 1949.

Other personnel who are engaged in the operation and administration of civilian hospitals shall be entitled to respect and protection and to wear the armlet, as provided in and under the conditions prescribed in this Article, while they are employed on such duties. The identity card shall state the duties on which they are employed.

The management of each hospital shall at all times hold at the disposal of the competent national or occupying authorities an up-to-date list of such personnel.

Article 21.
Convoys of vehicles or hospital trains on land or specially provided vessels on sea, conveying wounded and sick civilians, the infirm and maternity cases, shall be respected and protected in the same manner as the hospitals provided for in Article 18, and shall be marked, with the consent of the State, by the display of the distinctive emblem provided for in Article 38 of the Geneva Convention for the Amelioration of the Condition of the Wounded and Sick in Armed Forces in the Field of 12 August 1949.

Article22.
Aircraft exclusively employed for the removal of wounded and sick civilians, the infirm and maternity cases or for the transport of medical personnel and equipment, shall not be attacked, but shall be respected while flying at heights, times and on routes specifically agreed upon between all the Parties to the conflict concerned.

They may be marked with the distinctive emblem provided for in Article 38 of the Geneva Convention for the Amelioration of the Condition of the Wounded and Sick in Armed Forces in the Field of 12 August 1949.

Unless agreed otherwise, flights over enemy or enemy occupied territory are prohibited.

Such aircraft shall obey every summons to land. In the event of a landing thus imposed, the aircraft with its occupants may continue its flight after examination, if any.

Article 23.
Each High Contracting Party shall allow the free passage of all consignments of medical and hospital stores and objects necessary for religious worship intended only for civilians of another High Contracting Party, even if the latter is its adversary. It shall likewise permit the free passage of all consignments of essential foodstuffs, clothing and tonics intended for children under fifteen, expectant mothers and maternity cases.

The obligation of a High Contracting Party to allow the free passage of the consignments indicated in the preceding paragraph is subject to the condition that this Party is satisfied that there are no serious reasons
for fearing:

(a) that the consignments may be diverted from their destination,
(b) that the control may not be effective, or
(c) that a definite advantage may accrue to the military efforts or economy of the enemy through the substitution of the above-mentioned consignments for goods which would otherwise be provided or produced by the enemy or through the release of such material, services or facilities as would otherwise be required for the production of such goods.

The Power which allows the passage of the consignments indicated in the first paragraph of this Article may make such permission conditional on the distribution to the persons benefited thereby being made under the local supervision of the Protecting Powers.

Such consignments shall be forwarded as rapidly as possible, and the Power which permits their free passage shall have the right to prescribe the technical arrangements under which such passage is allowed.