Related Rule
Canada
Practice Relating to Rule 112. Search for and Collection of the Dead
Canada’s LOAC Manual (1999) provides that the belligerents “must also search for the dead”. 
Canada, LOA The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999C Manual (1999), p. 9-1, § 9; see also p. 11-2, § 16.
With respect to non-international armed conflicts in particular, the manual specifies: “Steps must also be taken to search for the dead”. 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 17-4, § 32.
The manual also states:
Parties to the conflict shall endeavour to reach agreements to allow teams to search for … 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 Level, Office of the Judge Advocate General, 1999, p. 9-5, § 53.
Canada’s Code of Conduct (2001) provides: “There is … an obligation to search for … the dead”. 
Canada, Code of Conduct for CF Personnel, Office of the Judge Advocate General, 4 June 2001, Rule 7, § 3.
Canada’s LOAC Manual (2001) states in its chapter on the treatment of the wounded, sick and shipwrecked: “The parties to a conflict must protect the wounded, sick and shipwrecked from pillage and ill-treatment and ensure their adequate care. They must also search for the dead and prevent their remains from being despoiled.” 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 904.2.
The manual further states:
924. Search for missing and dead
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.
In its chapter on the treatment of civilians in the hands of a party to the conflict or an occupying power, the manual states: “As far as military considerations permit, the belligerents must facilitate any steps to search for killed and wounded, to assist shipwrecked and other persons exposed to grave danger, and to protect them against pillage and ill-treatment.” 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 1110.
In its chapter on non-international armed conflicts, the manual states: “After any engagement and whenever circumstances permit, all possible steps must be taken without delay to search for and collect the wounded, sick and shipwrecked … Steps must also be taken to search for the dead”. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 1718.
Canada’s Code of Conduct (2005) states that there is “an obligation to search for … the dead”. 
Canada, Code of Conduct for CF Personnel, Office of the Judge Advocate General, 2005, Rule 7, § 3.