peacekeeper

noun3

1. •
   One that preserves the peace.
2. •
   A member of a military force charged with peacekeeping duties in a troublespot.

   • The grainy footage showed the peacekeepers first bound and beaten, then hooded and dead, hanging by the neck from a wooden ceiling beam. . — 2013
3. •
   (Canada) An officer of the peace (police officer) in a force run by a Canadian aboriginal community.