Jocko Willink and Leif Babin codified the Laws of Combat in their book, Extreme Ownership, and it takes all four principles to be a truly effective leader. So, which law is the most important in leadership? What order should leaders implement them? The Laws of Combat build on one another: 1. Cover and Move: Leadership starts with a team that works together. 2. Simple: You must identify the mission that your team is trying to accomplish and explain it to them in a simple, clear, and concise way s