In a broad new policy statement that is in its final drafting stage, the Defense Department asserts that America's political and military mission in the post-Cold-War era will be to insure that no rival superpower is allowed to emerge in Western Europe, Asia or the territory of the former Soviet Union. The classified document makes the case for a world dominated by one superpower whose position can be perpetuated by constructive behavior and sufficient military might to deter any nation or group of nations from challenging American primacy. With its focus on this concept of benevolent domination by one power, the Pentagon document articulates the clearest rejection to date of collective internationalism, the strategy that emerged from World War II when the five victorious powers sought to form a United Nations that could mediate disputes and police outbreaks of violence. Though the document is internal to the Pentagon and is not provided to Congress, its policy statements are developed in conjunction with the National Security Council and in consultation with the President or his senior national security advisers. Its drafting has been supervised by Paul D. Wolfowitz, the Pentagon's Under Secretary for Policy. Mr. Wolfowitz often represents the Pentagon on the Deputies Committee, which formulates policy in an interagency process dominated by the State and Defense departments. The document is known in Pentagon parlance as the Defense Planning Guidance, an internal Administration policy statement that is distributed to the military leaders and civilian Defense Department heads to instruct them on how to prepare their forces, budgets and strategy for the remainder of the decade.