Related Rule
Argentina
Practice Relating to Rule 117. Accounting for Missing Persons
Argentina’s Law of War Manual (1989) provides: “At all times, particularly after an engagement, the parties to the conflict shall, without delay, take all possible measures to search for … missing persons.” 
Argentina, Leyes de Guerra, PC-08-01, Público, Edición 1989, Estado Mayor Conjunto de las Fuerzas Armadas, aprobado por Resolución No. 489/89 del Ministerio de Defensa, 23 April 1990, § 2.05; see also § 6.01.
Argentina’s Law of War Manual (1989) states:
Information recorded shall be communicated as soon as possible to the National Office provided for, so that it can be transmitted to the adverse party, in particular through the Central Tracing Agency of the International Committee of the Red Cross. 
Argentina, Leyes de Guerra, PC-08-01, Público, Edición 1989, Estado Mayor Conjunto de las Fuerzas Armadas, aprobado por Resolución No. 489/89 del Ministerio de Defensa, 23 April 1990, § 6.02.
Argentina’s Law of War Manual (1989) provides that a general principle is “for families to have the right to know the fate of their relatives”. 
Argentina, Leyes de Guerra, PC-08-01, Público, Edición 1989, Estado Mayor Conjunto de las Fuerzas Armadas, aprobado por Resolución No. 489/89 del Ministerio de Defensa, 23 April 1990, § 2.05.
The manual also provides that the High Contracting Parties and the parties to the conflict shall in particular
facilitate enquiries made by members of families dispersed owing to the war, with the object of renewing contact with one another and of meeting, if possible. All persons in the territory of a Party to the conflict, or in a territory occupied by it, shall be enabled to give news of a strictly personal nature to members of their families, wherever they may be, and to receive news from them. 
Argentina, Leyes de Guerra, PC-08-01, Público, Edición 1989, Estado Mayor Conjunto de las Fuerzas Armadas, aprobado por Resolución No. 489/89 del Ministerio de Defensa, 23 April 1990, § 4.14.