Every day, in field operations around the world, men and women serve under the flag of the United Nations to build and maintain peace, to relieve human suffering, and to promote human rights and sustainable development. Link (pdf)
There are 66,000 military and 15,000 civilian peacekeepers.
115 members of those missions paid the highest price for their dedication to peace in 2004, with 39 more already killed during 2005.