 Most peacekeeping has been done by the United Nations, drawing on the military forces of its members.Traditional peacekeeping involved enforcing ceasefires, but in the last few years, the peacekeeper's duties have grown to include such services as the delivery of humanitarian aid, the supervision of elections, and maintenance of law and order.Research shows that as they go about these new responsibilities, peacekeepers – officers more so than enlisted men – often become heavily involved in negotiation and mediation.