U.N. Wants NYC Cops for Peacekeeping

U.N. Wants NYC Cops for Peacekeeping:
"The U.N. peacekeeping department said 321 American police officers are currently involved in missions abroad, primarily training local police. Of those, 225 are in the Kosovo region of Yugoslavia, and others are in Haiti, Liberia and Sudan."

I thought they just used military troops - sounds like a good (but dangerous) gig for police if they want to see the world.