This report summarizes RAND's research for the Office of the Assistant Secretary of Defense, focusing on the implications of information warfare for national security. It highlights the increasing reliance of the U.S. military on vulnerable aspects of the national information infrastructure, emphasizing the need for defensive strategies in "strategic information warfare." The study explores how the evolution of cyberspace affects military and national security strategies, particularly in the post-Cold War context. It serves as a valuable resource for those interested in the intersection of the information revolution and warfare. Overall, the report underscores the necessity of adapting to technological advancements to maintain national security.