This book provides an analysis that determines which land-based strategic weapons the United States should retain in the post-Cold War era. The future of the former Soviet Union and deterrence theory are examined to develop strategic criteria for evaluating weapon systems. A computer model, included in the text, finds land-based forces that most inexpensively meet these criteria. Contents: Introduction; The Future Strategic Environment; How Much is Enough?; Weapons Systems; How to Find Optimal Force Postures; Results and Conclusions; Appendix; Tables; Figures.