IN _DEFENSE 101_, A CONCISE PRIMER FOR UNDERSTANDING THE UNITED STATES' $700+ BILLION DEFENSE BUDGET AND RAPIDLY CHANGING MILITARY TECHNOLOGIES, MICHAEL O'HANLON PROVIDES A DEEPLY INFORMED YET ACCESSIBLE ANALYSIS OF AMERICAN MILITARY POWER.  After an introduction in which O'Hanlon surveys today's international security environment, provides a brief sketch of the history of the US military, its command structure, the organization of its three million personnel, and a review of its domestic basing and global reach, _DEFENSE 101_ provides in-depth coverage of four critical areas in military affairs: • Defense Budgeting and Resource Allocation: detailed budget and cost breakdowns, wartime spending allocations, economics of overseas basing, military readiness, and defense budgeting versus US grand strategy • Gaming and Modeling Combat: wargaming, micro modeling, nuclear exchange calculations, China scenarios, and assessments of counterinsurgency missions • Technological Change and Military Innovation: use of computers, communications, and robotics, cutting-edge developments in projectiles and propulsion systems • The Science of War, military uses of space, missile defense, and nuclear weapons, testing, and proliferation For policy makers and experts, military professionals, students, and citizens alike, _DEFENSE 101_ helps make sense of the US Department of Defense, the basics of war and the future of armed conflict, and the most important characteristics of the American military.