This book is organized in three main parts. The first part explores the evolution of cyberspace strategy through a series of government publications leading up to the DoD Strategy for Operating in Cyberspace. It is seen that, although each strategy has different emphases on ideas, some major themes recur. In the second part, each strategic initiative is elaborated and critiqued in terms of significance, novelty, and practicality. In the third part, the book critiques the DoD Strategy as a whole. Is it comprehensive and adequate to maintain U.S. superiority in cyberspace against a rapidly changing threat landscape? Shortcomings in the strategy are identified, and recommendations are made for improvement in future versions.