Report of the Defense Science Board 2007 Summer Study: Challenges to Military Operations in Support of U.S. Interests: Volume II: Main Report [open pdf - 10MB]
This study "concerns itself with challenges the U.S. military might face in the future, emphasizing areas where the nation is less well prepared. Future adversaries are more likely to attack the nation with asymmetric tools of war, employed using non-traditional concepts of operation. Thus, challenges from nuclear weapons, from cyber warfare, in and from space, to force deployment and resupply, and on U.S. soil, may well dominate in the decades ahead. Addressing U.S. vulnerabilities in these and other areas is the focus of the study's effort, leading to actions for the Department that can improve the nation's posture against future threats."
Defense Science Board: http://www.acq.osd.mil/dsb/reports.htm