I enlisted in the United States Marine Corps in 1996. I was nineteen years old, I thought I knew something about leadership, and I was wrong about almost all of it.
What the Marine Corps gave me — and what I've spent the 25 years since trying to apply in boardrooms, executive teams, and portfolio companies — wasn't a set of tactics. It was a framework. A way of thinking about human performance, organizational culture, and the relationship between standards and outcomes that I've never seen matched in any business school curriculum or leadership development program.
Here's what actually transferred.
Standards Are Not Rules. They're Identity.
The Marine Corps doesn't just tell you what to do. It tells you who you are. From the first day of boot camp, the entire apparatus of the institution is pointed at a single outcome: transforming a civilian into someone who holds themselves to a standard that most people would consider unreasonable.
The physical standard. The tactical standard. The ethical standard. The standard of how you treat the person next to you when you're exhausted and scared and there's no one watching.
What I've seen in every high-performing organization since — and what's been conspicuously absent in every underperforming one — is this same distinction. The best teams don't operate from a rulebook. They operate from an identity. The standard isn't something external that's enforced on them. It's something internal that they enforce on themselves.
Bill Walsh called it the Standard of Performance. Nick Saban calls it The Process. The Marine Corps calls it the Warrior Ethos. The words are different. The mechanism is identical.
When you're building a team — whether it's a rifle squad or a sales organization — your primary job is not to set rules. It's to build an identity. To answer the question: who are we, and what do we do that people like us don't do?
Get that right and the rules become mostly unnecessary. The identity does the work.
Mission Clarity Is a Force Multiplier
One of the things the Marine Corps does better than almost any organization I've encountered is mission clarity. Before any operation, every Marine — from the most junior private to the commanding officer — understands the mission. Not just their piece of it. The whole thing. The commander's intent two levels up. The reason the objective matters. What winning looks like.
The reason for this is both tactical and psychological. Tactically, it means that when conditions change — and they always change — every person in the organization can make a decision aligned with the mission without waiting for orders. Psychologically, it means that everyone's effort is pointed at something that matters, something they understand, something they can see themselves contributing to.
Most businesses are shockingly bad at this. They have mission statements on the wall and quarterly targets in the model, but the people doing the actual work often have only a dim understanding of how their daily effort connects to either. They know their tasks. They don't always know why the tasks matter.
The cost of that disconnect is enormous. People do their jobs instead of doing the mission. They optimize their piece instead of the whole. And when conditions change — as they always do — they wait for instructions instead of acting on intent.
The fix is not a better PowerPoint deck at the all-hands meeting. It's a relentless, daily commitment to connecting every person's work to the outcome that actually matters. What are we trying to accomplish? Why does it matter? How does what you're doing today move us toward it?
Ask those questions in every meeting, every one-on-one, every performance review. Watch what happens to the team.
You Find Out Who People Are Under Pressure
The Marine Corps has a saying: everyone wants to be a Marine until it's time to do Marine things.
Business has an equivalent. Everyone performs in good conditions. The question is what happens when the conditions aren't good. When the quarter is going sideways. When a key person leaves. When the competition makes a move no one anticipated. When the board is asking hard questions and the answers aren't clean.
That's when you find out what your team is actually made of. And more importantly, that's when you find out what your culture is actually made of.
I've been in rooms where pressure caused people to get smaller — to retreat into self-protection, to stop communicating, to start looking for someone to blame. And I've been in rooms where pressure caused people to get bigger — to lean in, to communicate more, to take ownership of problems that weren't technically theirs.
The difference between those rooms is almost never talent. It's almost always culture. What gets modeled at the top when things are hard. What gets rewarded and what gets tolerated. Whether the leader gets smaller or bigger under pressure — because whatever the leader does, the team does.
The Marine Corps trains this deliberately. Every evolution is designed to create pressure — physical, mental, emotional — and then teach you how to perform inside it. The training is harder than the deployment because the institution understands that you cannot develop pressure resilience without pressure.
Most organizations don't train for this at all. They hire for performance in good conditions and then act surprised when those same people struggle in hard ones.
What I Carried Out
I left the Marine Corps in 2000 with a set of principles that have shaped every leadership decision I've made since. Not tactics — principles.
Standards define identity. Mission clarity multiplies force. Pressure reveals culture. And the leader's job is not to have all the answers — it's to build the team and the system that can find them.
Those principles work in a rifle company. They work in a $200M business. They work on a youth sports field. The application changes. The principles don't.
That's what a system looks like. It travels with you. It doesn't depend on the industry, the headcount, or the budget. It depends on the conviction to apply it — consistently, relentlessly, in good conditions and bad.
That's what the Marine Corps taught me. Everything else has been application.