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Convention relative to the Treatment of Prisoners of War. Geneva, 27 July 1929.
Part III : Captivity #Section II : Prisoners of war camps #Chapter 6 : Special provisions concerning officers and persons of equivalent status - Art. 22.
Art. 22. In order to ensure the service of officers' camps, soldier prisoners of war of the same armed forces, and as far as possible speaking the same language, shall be detached for service therein in sufficient number, having regard to the rank of the officers and persons of equivalent status.
Officers and persons of equivalent status shall procure their food and clothing from the pay to be paid to them by the detaining Power. The management of a mess by officers themselves shall be facilitated in every way.