"In 1993, the Chairman of the Joint Chiefs of Staff determined that the United States no longer needed a large, dedicated air defense force because of the near disappearance of the Soviet threat. Consequently, the Chairman concluded that the dedicated force could be significantly reduced or eliminated and that existing active and reserve general-purpose combat and training forces could be tasked to perform the continental air defense mission. The Chairman expected that his recommendations would result in significant savings in personnel and operating costs. The analysis leading to the Chairman's conclusion and recommendations focused on the forces the United States dedicates to the air defense mission. Likewise, this report discusses the roles and missions of the U.S. forces and does not include any analysis of Canadian forces."
Government Accountability Office (GAO): http://www.gao.gov/