Book excerpt: This book is a collection of essays that provide historical insight, lessons learned from experience, and illustrations of strategy in practice. Designed as a primer for mid-career military professionals, On Strategy culls the expertise of a diverse group of strategists who represent the brightest minds of the field. They offer a succinct breakdown and instruction on how to think and act strategically at every level. It is a comprehensive and useful book that connects foundational theory to contemporary complexities.