Imagine a world where almost everyone wakes up inspired to go to work, feels trusted and valued during the day, then returns home feeling fulfilled. This is not a crazy, idealized notion. As Simon Sinek noticed in his travels around the world, great leaders create environments in which people naturally work together to do remarkable things. Some of these teams trust each other so deeply that they would literally put their lives on the line for each other. Far more common, unfortunately, are teams that seem doomed to infighting, fragmentation, and failure, no matter what incentives are offered. But why? The answer became clear during a conversation with a Marine Corps general who explained a USMC tradition: “Officers eat last.” Sinek watched as the most junior Marines ate first while the most senior Marines took their place at the back of the line. What’s symbolic in the chow hall is deadly serious on the battlefield: Great leaders sacrifice their own comfort—even their own survival—for the good of those in their care.