"Extreme Ownership" by Jocko Willink and Leif Babin is a book about leadership and discipline, based on the authors' experiences as U.S. Navy Seals. The core concept is that a true leader must take full responsibility for both the successes and failures of their team or organization.
Can't Hurt Me is a guide to building mental toughness, and it's also the motivational life story of David Goggins. When he was young David survived abuse and racism, but later he transformed himself into a Navy SEAL, ultramarathon runner, and world record holder.