Varies massively with nation and even more with the situation. A quick Google turned up the US DoD [manual on the laws of war](https://dod.defense.gov/Portals/1/Documents/pubs/DoD%20Law%20of%20War%20Manual%20-%20June%202015%20Updated%20Dec%202016.pdf?ver=2016-12-13-172036-190) in its December 2016 version. Pages 455-457 are the relevant reading but in summary: Identify the deceased, determine cause of death, bury individually and according to the deceased’s religion as far as practical and return personal effects to next of kin.
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