“Fight for the Final Frontier should be required reading across the professional military education community. The application of irregular warfare theory is a fresh perspective to view the current and evolving conflict in space.”—Mike Fowler, Associate Professor of Military and Strategic Studies, editor of Military Strategy, Joint Operations, and Airpower

"Klein consults and teaches space policy and strategy. War in space is unique because of the characteristics of the domain. Still, since conflict is a duel between humans, there are strategic insights—from Sun Tzu to Clausewitz to Mahan—that can be applied (with caution) to the space domain. Conflict in space is likely to be long, indecisive, messy, and very political. Klein's praiseworthy effort to apply irregular war theory to space is especially useful and valuable. Concepts like hybrid warfare, protracted operations, lawfare, attrition, terrorism, friction, deception, cumulative strategies, non-state actors, dispersal, coordination, maneuver, and surprise are critically important. If the book has any shortcomings, it is downplaying the unique characteristics and geography of space operations—things like gravity wells, constant movement, the energy requirements to shift from one orbit to another, and potential choke points in Celestial Lines of Communication, similar to those in Sea Lines of Communication. Perhaps Klein's next book can expand on these issues. Strategy is important. Logistics is the foundation that makes it possible, especially in space. But what Klein does, he does very well. An excellent contribution. Highly Recommended" —Choice