Related Rule
United States of America
Practice Relating to Rule 116. Accounting for the Dead
Section B. Recording of the location of graves
The US Field Manual (1956) reproduces Article 17 of the 1949 Geneva Convention I. 
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 Operational Law Handbook (1993) provides: “The Parties must … register grave sites, and, as soon as circumstances permit, relay to the affected Party, the exact location of burial and details of death.” 
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.