Соответствующая норма
Spain
Practice Relating to Rule 117. Accounting for Missing Persons
Section D. Right of the families to know the fate of their relatives
Spain’s LOAC Manual (1996) provides: “The provisions of the law of armed conflicts concerning the dead are based on the right of the families to know the fate of their relatives.” 
Spain, Orientaciones. El Derecho de los Conflictos Armados, Publicación OR7-004, 2 Tomos, aprobado por el Estado Mayor del Ejército, Division de Operaciones, 18 March 1996, Vol. I, § 5.2.d.(6).
Spain’s LOAC Manual (2007) states: “The provisions of the law of armed conflict concerning enemy dead are based on the right of families to know what has happened to them.” 
Spain, Orientaciones. El Derecho de los Conflictos Armados, Tomo 1, Publicación OR7–004, (Edición Segunda), Mando de Adiestramiento y Doctrina, Dirección de Doctrina, Orgánica y Materiales, 2 November 2007, § 5.2.d.(6).