Extreme Ownership is written by two former Navy SEALs, Jocko Willink and Leif Babin, who now head a leadership training company. The experiences they share in this book are intense and eye-opening--not to mention unique. There aren't many books out there that give such detailed glimpses into the lives of SEALs in action.
The book is structured in a very basic and clear way. The authors convey one main point per chapter by sharing a story from their battlefield experiences, then highlighting the main principle of that story, and finally giving a concrete example of how this principle applies in business settings.