This current volume seeks to provide some clarity regarding the history and current capabilities of the cyber domain. Its authors have largely, though not exclusively, focused upon the Western experience, particularly the United States. In part, this is due to the availability of open source, unclassified data. Not only are the sources more readily available, but they tend to be more applicable to the target audience for this work. The authors come from a wide variety of backgrounds, with a substantial number of them serving in the military or other governmental institutions. As such, it needs to be stated that the ideas and arguments presented in this volume are the opinions of the individual authors, based upon their expertise, and do not represent the position of any government, military entity, or institution.