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United States of America
Practice Relating to Rule 115. Disposal of the Dead
Section C. Cremation of bodies
The US Field Manual (1956) provides:
Bodies shall not be cremated except for imperative reasons of hygiene or for motives based on the religion of the deceased. In case of cremation, the circumstances and reasons for cremation shall be stated in detail in the death certificate or on the authenticated list of the dead. 
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.
The US Air Force Pamphlet (1976) provides: “Cremation is permitted only for imperative reasons of hygiene or for motives based on the deceased’s religion.” 
United States, Air Force Pamphlet 110-31, International Law – The Conduct of Armed Conflict and Air Operations, US Department of the Air Force, 1976, § 12-2(a).
The US Operational Law Handbook (1993) provides: “Parties may cremate the dead only for hygienic or religious reasons.” 
United States, Operational Law Handbook, JA 422, Center for Law and Military Operations and International Law Division, The Judge Advocate General’s School, United States Army, Charlottesville, Virginia 22903-1781, 1993, p. Q-185.