The article reviews proposals to create a United Nations standing armed force as opposed to a rapid reaction force. In either case, to play its optimal role in the future of peacekeeping operations, the U.N. will have to face up to new demands, beyond those contemplated in 1945. Given the resistance in Iraq that has surprised two major powers (the United States and the United Kingdom), it is plausible that a truly collective effort by the U.N., even at higher costs in people and finance, merits serious consideration in order to secure peaceful lives in the world.