The first is do the exact opposite of what the guy in front of you is doing—so if he looks left, then you look right. The second is trickier: the person who knows what to do next is the leader. We’re entirely nonhierarchical in that way. But in a combat environment, when split seconds make all the difference, there’s no time for second-guessing. When someone steps up to become the new leader, everyone, immediately, automatically, moves with him. It’s the only way we win.”