Developing future aerospace leaders is the key to ensuring the national security of the country. Such development is based on a firm understanding of the theory, principles, and applications of aerospace power. Without this foundation, aerospace and military leaders would have a difficult time deploying and using air and space forces in today's dynamic world. With the end of the Cold War, the United States military has been challenged by a series of world events that have forced aerospace leaders to apply air and space power in many innovative ways. They have had to focus on and question many previously held beliefs about air and space power. Future leaders will need to be well grounded in the capabilities and limitations of aerospace power to envision how to plan, operate, and build aerospace capabilities. Dr. Chun's Aerospace Power in the Twenty-First Century: A Basic Primer is a great start towards understanding the importance of aerospace power and its ability to conduct modern warfare. Aerospace power is continually changing because of new technology, threats, and air and space theories. However, many basic principles about aerospace power have stood the test of time and warfare. This book provides the reader with many of these time-tested ideas for consideration and reflection. Although Aerospace Power in the Twenty-First Century was written for future officers, individuals desiring a broad overview of aerospace power are invited to read, share, and discuss many of the ideas and thoughts presented here. Officers from other services will find that this introduction to air and space forces will give them a good grasp of aerospace power. More experienced aerospace leaders can use this book to revisit many of the issues that have affected air and space forces in the past and that might affect them in the future. Air Force officers will discover that Aerospace Power in the Twenty-First Century is a very timely and reflective resource for their professional libraries. Lieutenant General John R. Dallagher Superintendent, United Stat