My definition, the definition that I've always believed in, is that esprit de corps means love for one's own military legion - in my case, the United States Marine Corps. It means more than self-preservation, religion, or patriotism. I've also learned that this loyalty to one's corps travels both ways: up and down.

The quote "My definition, the definition that I've always believed in, is that esprit de corps means love for one's own military legion—in my case, the United States Marine Corps. It means more than self-preservation, religion, or patriotism" by Chesty Puller, one of the most decorated U.S. Marines in history, speaks to the deep sense of loyalty and brotherhood within a military unit. Esprit de corps refers to the spirit, pride, and camaraderie that binds members of a group together. For Puller, this esprit de corps transcends mere duty or nationalistic feelings; it represents a profound emotional connection to one’s comrades and the institution itself.

Puller emphasizes that esprit de corps is more than individual survival or national allegiance. It’s about a shared bond with others in the same legion—in his case, the Marine Corps. He suggests that this connection is not just about patriotism or even about faith; it’s about a deeper, almost familial love and devotion to the unit and its mission. The idea that it goes beyond "self-preservation" hints that a Marine's loyalty isn't just about staying alive or fulfilling personal interests, but about the collective well-being and honor of the group as a whole.

The second part of the quote, "I've also learned that this loyalty to one's corps travels both ways: up and down," highlights the reciprocal nature of esprit de corps. Puller points out that leadership and loyalty are not one-sided. Effective military leaders understand that their bond with their troops is just as important as the troops’ loyalty to them. There’s a mutual respect and sense of duty that flows in both directions: leaders serve their soldiers, and soldiers, in turn, honor and trust their leaders. This shared loyalty strengthens the bond within the unit and ensures its success.

Puller’s perspective on esprit de corps encapsulates the deep emotional and moral commitment that members of the Marine Corps—and by extension, any tight-knit group—feel toward one another. This loyalty, born out of shared struggle and sacrifice, is what forms the bedrock of the unit's strength and unity. For Puller, the true power of esprit de corps lies in the mutual respect and the unbreakable bond that members share, enabling them to endure hardships and triumph together.