A UN Army?

For rapid intervention during a crisis. Can the UN do anything rapid? from NewsMax:

Crisis management experts are calling for the creation of a "United Nations army” – an international rapid reaction force that could be deployed within 48 hours to intervene in emergency situations around the globe.
Composed of up to 15,000 military, police and civilian staff, including medics, the proposed force would be recruited from professionals hired by the U.N. from many countries, and based at designated U.N. sites...University of Notre Dame political scientist Robert Johansen, the book's chief writer, says a U.N. force could help prevent horrendous conflict such as the Rwanda genocide and the current crisis in Darfur.

I don't think this would work. 15,000 troops is not enough to defeat the 500,000 man US Army, which the UN considers the main threat to world peace, not to mention the Israeli Army. As a matter of fact, the American Army has been doing the Useless Nation's job of Peacekeeping since its founding, from Korea to the Middle East.