Marine Corps Leadership Principles: The Complete Guide

What are the Marine Corps leadership principles?

The Marine Corps teaches 11 leadership principles and 14 leadership traits. The principles describe what a leader does: know yourself and seek self-improvement, know your Marines and look out for their welfare, set the example, and eight more. The traits describe what a leader is: justice, judgment, dependability and eleven others, held together by the mnemonic JJ DID TIE BUCKLE. Together they form a behavioral leadership curriculum the Corps has taught continuously for decades, and every Marine learns both lists by name.

This guide gives both lists in the order the Corps uses, in the Corps' own wording, sourced to official Marine Corps publications at marines.mil and usmcu.edu. It then does the part the .mil and .edu pages do not: it says what each item actually asks of a leader who has no rank, no uniform and no authority to order anyone to do anything. I enlisted in 1988 and trained as a Marine sniper, then spent three decades applying this material with executive teams. Both halves of that sentence matter for what follows.

The 11 leadership principles, one by one

These are the 11 principles as the Marine Corps publishes them, in the Corps' order. Each one gets a sentence of plain explanation and a sentence on what it asks of a civilian leader.

• Know yourself and seek self-improvement. Take an honest inventory of your strengths and weaknesses and work deliberately on the weak ones. In a company this is the distance between a leader who has received feedback and a leader who acts on it, and the people around you already know which one you are.
• Be technically and tactically proficient. Know your own job, and know the work of the people you lead well enough to be useful to them. You do not have to write the code, but if you cannot follow the argument about why the migration is hard, you cannot lead the people having it.
• Know your Marines and look out for their welfare. Learn who your people actually are, and protect their interests as seriously as you protect the mission. Most managers know their team's deliverables and almost nothing about their constraints, which is why the welfare half is the half that gets dropped.
• Keep your Marines informed. People execute better when they understand why, and information withheld gets read as a judgment about who deserves to know. In a company the withheld item is usually a reorganization or a budget decision, and the silence costs more than the news would have.
• Set the example. Every standard you enforce is measured against your own conduct first. A leader who asks for candor and then goes quiet in front of a senior audience has just set the real standard, whatever the poster in reception says.
• Ensure the task is understood, supervised, and accomplished. Explain the task, check that it landed, stay close enough to catch a problem early, and see it finished. Three quarters of civilian delegation stops after the first verb.
• Train your Marines as a team. Skill gets developed in the unit that will use it, under the conditions it will be used in. Individual training budgets are easy to approve and team rehearsal is not, which is unfortunate, because the second one is what changes how a group performs under pressure.
• Make sound and timely decisions. Weigh the facts, decide, and decide in time for the decision to still be worth something. Late and correct is a category of failure most executive teams do not track at all.
• Develop a sense of responsibility among your subordinates. Give people real authority and real consequences so responsibility becomes theirs rather than yours on loan. This is the principle most often broken by well-meaning managers, who take the work back instead of letting someone struggle through it.
• Employ your command in accordance with its capabilities. Ask of a unit what it can actually do, and no more. In a company this reads as capacity planning, and a leader who keeps assigning work the team cannot finish is teaching them that the plan is fiction.
• Seek responsibility and take responsibility for your actions. Ask for the harder job, and own the outcome when it goes badly. The public version of the second half, said out loud in a room where it costs you something, moves trust further than any other single act I have watched.

The first sentence of each pair is Marine Corps doctrine. The second is mine.

The 14 leadership traits and the JJ DID TIE BUCKLE mnemonic

The 14 traits are memorized with JJ DID TIE BUCKLE, one letter per trait, in this order. The definitions below are the Corps' own. Where the principles tell a leader what to do, the traits describe the character a Marine is expected to build, and every one of them was chosen because other people can see it in you.

• Justice. Giving reward and punishment according to the merits of the case, impartially and consistently.
• Judgment. Weighing facts and possible courses of action in order to make a sound decision.
• Dependability. The certainty of proper performance of duty.
• Initiative. Taking action in the absence of orders.
• Decisiveness. Making decisions promptly and announcing them in a clear, forceful manner.
• Tact. Dealing with people without creating offense.
• Integrity. Uprightness of character and soundness of moral principle, including truthfulness and honesty.
• Enthusiasm. Sincere interest and exuberance in the performance of duty.
• Bearing. Creating a favorable impression in carriage, appearance and personal conduct at all times.
• Unselfishness. Avoiding the provision of your own comfort and advancement at the expense of others.
• Courage. The mental quality that recognizes fear of danger or criticism and enables a Marine to proceed in the face of it with calmness and firmness.
• Knowledge. Understanding of a science or an art, including professional knowledge and knowledge of your Marines.
• Loyalty. Faithfulness to country, the Corps, the unit, and to seniors, subordinates and peers.
• Endurance. Mental and physical stamina, measured by the ability to withstand pain, fatigue, stress and hardship.

The traits are not a scoring instrument, and the Corps has never presented them as one. They are a vocabulary for observation and correction, which is a different and more useful thing.

Principles and traits: what each one asks of you

Marines learn both lists because the two answer different questions. A principle is an instruction. A trait is a quality. You can follow a principle you have not yet built the trait for, badly, and you can hold a trait and still lead badly because nobody taught you what to do with it.

The Corps teaches both because either one alone produces a recognizable failure. A leader with the principles and none of the traits runs a competent, joyless unit that nobody follows a step further than required. A leader with the traits and none of the principles is admired and ineffective. I have met both in boardrooms and neither is rare.

Where the principles came from, and why they have barely changed

Both lists were codified into Marine Corps doctrine in the middle of the twentieth century and have carried forward with very little change in wording. I am deliberately not giving you a founding date. The dates that circulate online do not agree with each other, and the rule I hold this page to is that anything I cannot source to an official Marine Corps publication stays off it.

What can be said with confidence is why they survived. Both lists describe behavior rather than context. Nothing in dependability, or in ensure the task is understood, supervised, and accomplished, depends on a particular weapon system, a particular theater or a particular decade. A list written tightly around the conditions of 1950 would have needed rewriting by 1970. This one did not.

The second reason is institutional. Every Marine is trained on this material, so the list has millions of people who can recite it, which makes it expensive to change and cheap to use as shared vocabulary. Most corporate value sets have neither property. They get rewritten by the incoming chief people officer, and a year later nobody in the building can name them.

What transfers to a civilian team, and what does not

Start with whether the underlying thing is worth chasing. De Jong, Dirks and Gillespie, publishing in the Journal of Applied Psychology in 2016, pooled 112 independent studies covering 7,763 teams and found that intrateam trust holds an above-average relationship with team performance, one that survives controls for other predictors. Trust sits among the better-supported predictors of how a team performs, not beside them.

What transfers from the Corps is the delivery system. Three parts of it hold up anywhere: a standard written in words people can recall, correction that happens openly and then ends, and repeated small proof under low stakes long before anyone needs proof under high stakes. None of the three requires authority.

What does not transfer is the enforcement. A Marine cannot resign on a Thursday afternoon. Your best engineer can. Shared physical risk does quiet work in a rifle platoon that a quarterly target will never do. And the Corps can order compliance, which is a different substance from trust. It cannot order a lance corporal to tell a captain that the plan is wrong, which is why two of the fourteen traits, courage and justice, carry so much of the load.

The failure mode is predictable. A leader borrows the posture, the directness and the ceremony, then skips the curriculum: the daily correction, the reciprocal duty to look after people, the patience to build proof before it is needed. What comes out is a harsher room carrying exactly the trust it already had. The mechanism is worked through in more detail in How the Marine Corps Builds Trust in a Matter of Days.

How the principles map onto the 12 Cs of Trust

The TrustFlow™ 12 Cs of Trust are the framework I built for civilian teams, and they share the Corps' central assumption: that trust is behavior other people can observe, not a sentiment someone reports. The 12 Cs sit in four quadrants. Foundations covers Character, Courage and Commitment. Essentials covers Connection, Communication and Caring. The Work covers Clarify, Collaboration and Coaching. Results covers Consistency, Competence and Closeout.

Now the places the mapping breaks, because it does. Connection has no clean counterpart in the principles, and the omission makes sense from the Corps' side: a rifle platoon gets connection free from proximity and shared hardship, so doctrine never had to ask for it. A distributed team gets none of it free. Closeout has no counterpart either, because in a unit the closing of a loop is enforced structurally rather than left to one leader's discipline. Two principles map onto Competence and two onto Clarify, which tells you the Corps weights execution more heavily than a civilian framework would. And Commitment is absent because in the Corps it is assumed, which is the one assumption a company cannot make. The full framework is in The 12 Cs of Trust.

How to use one principle a week for the next eleven weeks

Eleven principles, eleven weeks, taken in the Corps' order and worked in the open so people can see what you are doing. Eleven small, visible acts of this kind are what I mean by Micro-Trust Activations™.

Monday morning, name the week's principle to your team in one line, and say what you intend to do differently because of it. The naming matters as much as the doing, because it hands everyone the vocabulary to tell you when you missed.

Thursday, ask one person for a specific read. Not how am I doing. Ask whether the thing you said you would do landed: this week I said I would get you the budget answer before you had to chase it, did that happen or did it not.

Friday, write two lines for yourself. What the evidence was, and what carries into next week.

Eleven weeks from a Monday in September puts you in late November holding a written record of eleven behaviors, observed by the people they were aimed at. That is a different artifact from a course certificate, and the difference is the observation.

If you want the team-level number rather than your own, that is the Team TrustFlow Index, which scores a team across all 12 Cs on a 1.00-5.00 scale with bands for Constrained Trust, Developing Trust and Sustained TrustFlow. Start with Integrity in Leadership if character is the part you want to work first, and book the military leadership keynote if you would rather your whole team heard this at once.

Frequently asked questions

What are the 11 leadership principles of the Marine Corps?

The United States Marine Corps teaches 11 leadership principles: know yourself and seek self-improvement; be technically and tactically proficient; know your Marines and look out for their welfare; keep your Marines informed; set the example; ensure the task is understood, supervised, and accomplished; train your Marines as a team; make sound and timely decisions; develop a sense of responsibility among your subordinates; employ your command in accordance with its capabilities; and seek responsibility and take responsibility for your actions.

What are the 14 leadership traits?

Justice, judgment, dependability, initiative, decisiveness, tact, integrity, enthusiasm, bearing, unselfishness, courage, knowledge, loyalty and endurance. The Marine Corps teaches them in that order so the mnemonic JJ DID TIE BUCKLE works, one letter per trait. Where the 11 principles describe what a leader does, the 14 traits describe the qualities a Marine is expected to build, and each was chosen because other people can observe it in you.

What does JJDIDTIEBUCKLE stand for?

It is the Marine Corps mnemonic for the 14 leadership traits, one letter each: Justice, Judgment, Dependability, Initiative, Decisiveness, Tact, Integrity, Enthusiasm, Bearing, Unselfishness, Courage, Knowledge, Loyalty, Endurance. The device exists because a standard nobody can recall under pressure has stopped functioning as a standard. An exhausted nineteen-year-old cannot retrieve a paragraph of values language, but can retrieve fourteen words through a phrase.

Are the Marine Corps leadership principles still used today?

Yes. They are taught to every Marine as part of formal leadership instruction and appear in official Marine Corps publications, including MCRP 6-11B, Marine Corps Values: A User's Guide for Discussion Leaders. The wording has carried forward with very little change, largely because the items describe behavior rather than context. Nothing in dependability or in keeping your Marines informed depends on a particular decade or a particular weapon system.

Do Marine Corps leadership principles work in business?

The delivery system transfers. A written standard people can recall, correction that happens openly and then ends, and repeated low-stakes proof all work without rank. The enforcement does not transfer. Your team can resign, shares no physical risk with you, and cannot be ordered into candor. Leaders who borrow the posture and skip the curriculum get a harsher room with the trust it already had.

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