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Canada
Practice Relating to Rule 117. Accounting for Missing Persons
Section A. Search for missing persons
Canada’s LOAC Manual (1999) provides: “As soon as possible, and certainly immediately upon the end of hostilities, each party to the conflict must search for those reported missing by the adverse party.” 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 9-5, § 52.
The manual further states: “To facilitate the finding of missing personnel, parties to the conflict shall endeavour to reach agreements to allow teams to search for … the dead from the battlefield areas.” 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 9-5, § 53.
Canada’s LOAC Manual (2001) states in its chapter on the treatment of the wounded, sick and shipwrecked:
1. The Geneva Conventions impose certain obligations on Detaining Powers with regard to the burial and reporting of dead personnel belonging to the adverse party. [The 1977 Additional Protocol I] also imposes obligations to search for the missing and to report upon the disposal of the remains of the dead.
2. As soon as possible, and certainly immediately upon the end of hostilities, each party to the conflict must search for those reported missing by the adverse party. The requests and all information, which may assist in tracing or identifying such person shall be transmitted through the Protecting Power or the Central Tracing Agency of the International Committee of the Red Cross (ICRC) or the national Red Cross Societies.
3. To facilitate the finding of missing personnel, parties to the conflict shall endeavour to reach agreements to allow teams to search for, identify and recover the dead from battlefield areas. They may also attach to such teams representatives of the adverse party when the search is taking place in areas controlled by the adverse party. While carrying out these duties, members of the teams shall be respected and protected. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 924.