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Rules concerning the Control of Wireless Telegraphy in Time of War and Air Warfare. Drafted by a Commission of Jurists at the Hague, December 1922 - February 1923.
Part II: Rules of Air Warfare#Chapter III: Belligerents. - Art. 14.
Art. 14. A military aircraft must be under the command of a person duly commissioned or matriculated military rolls of the State; the crew must be exclusively military.