Dag Hammarskjöld Medal is a posthumous award given by the United Nations ( UN ) to military personnel , police , or civilians who lose their lives while serving in a United Nations peacekeeping operation . The medal is named after Dag Hammarskjöld , the second Secretary-General of the United Nations , who died in a plane crash in what is now Zambia in September 1961
plane crash
1961 Ndola United Nations DC-6 crash
Dag Hammarskjöld Medal