Règle correspondante
United States of America
Practice Relating to Rule 115. Disposal of the Dead
Section E. Grouping of graves according to nationality
The US Field Manual (1956) provides that the “graves [of the dead] are … grouped if possible according to the nationality of the deceased”. 
United States, Field Manual 27-10, The Law of Land Warfare, US Department of the Army, 18 July 1956, as modified by Change No. 1, 15 July 1976, § 218.