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Tonga
Practice Relating to Rule 59. Improper Use of the Distinctive Emblems of the Geneva Conventions
Tonga’s Red Cross Society Act (1972) states:
It shall not be lawful for any person other than those authorised under section 5 of this Act or under the provisions of the … [1949] Geneva Conventions to use for any purpose whatever the emblem of the red cross on a white ground. 
Tonga, Red Cross Society Act, 1972, Section 9(1).