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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 5 : Internal discipline of camps - Art. 18.
Art. 18. Each prisoners of war camp shall be placed under the authority of a responsible officer.
In addition to external marks of respect required by the regulations in force in their own armed forces with regard to their nationals, prisoners of war shall be required to salute all officers of the detaining Power.
Officer prisoners of war shall be required to salute only officers of that Power who are their superiors or equals in rank.