By: Mark Leon Goldberg on May 25, 2010 May 29 is International Day of Peacekeeping. As the video below shows, this has been a very difficult year: before the Haiti tragedy, 121 peacekeepers were killed in the line of duty. The Haiti earthquake added 96 peacekeepers to that toll. Still, the world depends on UN Peacekeeping. There are 122,000 peacekeepers in 15 missions across the globe.