U.S. Nuclear Weapons: Changes in Policy and Force Structure

Publication Date: February 2008

Publisher: Library of Congress. Congressional Research Service

Author(s):

Research Area: Military and defense

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Abstract:

The Bush Administration conducted a review of U.S. nuclear weapons force posture during its first year in office. Although the review sought to adjust U.S. nuclear posture to address changes in the international security environment at the start of the new century, it continued many of the policies and programs that had been a part of the U.S. nuclear posture during the previous decade and during the Cold War. This report, which will be updated as needed, provides an overview of the U.S. nuclear posture to highlight areas of change and areas of continuity.

During the Cold War, the United States sought to deter the Soviet Union and its allies from attacking the United States and its allies by convincing the Soviet Union that any level of conflict could escalate into a nuclear exchange and, in that exchange, the United States would plan to destroy the full range of valued targets in the Soviet Union. Other nations were included in U.S. nuclear war plans due to their alliances with the Soviet Union. After the Cold War, the United States maintained a substantial nuclear arsenal to deter potential threats from Russia. It would not forswear the first use of nuclear weapons in conflicts with other nations, such as those armed with chemical or biological weapons, and formed contingency plans for such conflicts. The Bush Administration has emphasized that the United States and Russia are no longer enemies and that the United States will no longer plan or size its nuclear force to deter a "Russian threat." Instead, the United States will maintain a nuclear arsenal with the capabilities needed to counter capabilities of any potential adversary, focusing on "how we will fight" rather than "who we will fight." Furthermore, U.S. nuclear weapons will combine with missile defenses, conventional weapons, and a responsive infrastructure in seeking to assure U.S. allies, dissuade U.S. adversaries, deter conflict, and defeat adversaries if conflict should occur.

During the Cold War the United States maintained a "triad" of ICBMs, SLBMs, and heavy bombers in a strategic nuclear arsenal of more than 10,000 warheads. During the 1990s, the United States reduced the size of this arsenal to around 7,000 warheads , but maintained all three legs of the triad. The Bush Administration has announced that the United States will further reduce its arsenal to between 1,700 and 2,200 "operationally deployed" warheads, but that it will not eliminate many delivery vehicles while reducing its force and it will retain many nondeployed warheads in storage as a "responsive force" that could be added to the deployed forces if conditions warranted. The Bush Administration has also announced that it will expand and enhance the infrastructure that supports U.S. nuclear weapons, so that the United States could respond to unexpected changes in the status of its arsenal or the international security environment.

Analysts and observers have identified several issues raised by the Administration's Nuclear Posture Review. These include the role of nuclear weapons in U.S. national security policy, how to make the U.S. nuclear deterrent "credible," the relationship between the U.S. nuclear posture and the goal of discouraging nuclear proliferation, plans for strategic nuclear weapons, and the future of non-strategic nuclear weapons.