Rudyard Kipling wrote Boots in 1903.

He was writing about infantry soldiers in the British Army during the Boer War in South Africa — specifically about the psychological experience of the march, the way a single repeated physical action, sustained for long enough, comes to dominate consciousness entirely. The poem’s rhythm mimics the cadence of boots on hard ground. The refrain returns, again and again, to the same words — boots, boots, boots, boots, movin’ up and down again — in a pattern designed to reproduce, in the reader, the specific mental condition it describes: the inability to think about anything other than the next step, and the step after that, and the ten thousand steps after that, in a march that has no visible end.

Kipling was a poet of empire who understood, better than most of his contemporaries, the specific texture of what empire required from the bodies of the men who maintained it. Boots is not a celebratory poem. It is a poem about the point at which endurance becomes its own kind of suffering — the point where the body continues because the body has been trained to continue and the mind has been reduced, by repetition and exhaustion, to a single looping thought that it cannot exit.

The United States Navy read this poem and recognized something useful in it.

The path to becoming a Navy SEAL costs the United States government approximately one million dollars per candidate who completes it.

This figure encompasses the selection process, the training infrastructure, the instructors, the equipment, and the accumulated institutional knowledge of an organization that has spent decades refining its understanding of human limits. It is, in the context of military investment, an extraordinary sum to spend on a single individual — a deliberate inversion of the usual military logic of mass production, which prioritizes volume and standardization over the identification of exceptional individuals.

What makes the investment worthwhile, from the Navy’s perspective, is the specificity of what it produces. A Navy SEAL is not simply a well-trained soldier. They are someone who has been subjected, across eighteen months to two years, to a systematic process of identifying and eliminating every psychological and physical weakness available — and who has come out the other side still functional, still capable of operating under conditions that disable most people, still in possession of the judgment and the will that the selection process was designed to verify.

The final formal hurdle before a candidate earns the trident is SERE school.

SERE stands for Survival, Evasion, Resistance, and Escape. The course exists to prepare special operations personnel for the specific experience of being captured by an enemy force — to ensure that the men who carry the most sensitive operational knowledge in the American military are capable of withstanding the methods that adversaries use to extract that knowledge. The classroom portion of SERE covers the theory: the psychology of captivity, the techniques of interrogation, the physiological effects of sustained stress and sleep deprivation.

The field exercise covers the practice.

Former SEALs speak about the SERE field exercise with a consistent quality of restraint — not the restraint of men hiding trauma, though some of that is present, but the restraint of men who are aware that the details are sensitive and who have internalized, through years of operating in classified environments, the discipline of saying the shape of something without filling in the dimensions. What they will say, consistently, across different accounts from different years and different SEAL teams, is this:

There is a phase in which you are placed in a confined space.

The space is small. The light is limited or absent. You are, in the specific technical language of sensory deprivation, deprived of the environmental inputs that the brain uses to orient itself in time and space. And in that space, through a speaker you cannot see or reach or disable, a recording plays.

The recording is Rudyard Kipling’s Boots.

And it plays again.

And again.

The mechanics of why this works are not mysterious, though they are worth understanding.

The human brain is not designed for sustained exposure to a single repeated stimulus with no variation and no escape. It is designed for an environment that changes — that provides new inputs, new problems, new information to process. Deprived of that variation, the brain does not simply idle. It fixates. It loops. It turns the available stimulus over and over in a process that is not thought, exactly, but that occupies the space where thought happens and prevents anything else from forming there.

Kipling’s poem is particularly effective at producing this state because it was designed to describe it. The rhythm is insistent and regular. The refrain is repetitive by intention. The content — soldiers marching, unable to stop, unable to think of anything except the marching — mirrors the psychological condition of the person hearing it. You are listening to a description of the state you are in, in a rhythm that reinforces that state, with no way to stop listening.

Former SEALs who have been through it reach for similar language when describing the experience. They do not describe it as painful. They describe it as colonizing — a word that suggests something that enters and occupies, that takes up residence in a space that was previously your own. One described it as the closest he had come, in all of SEAL training, to the feeling of genuinely losing his mind. Not because he was in pain. Because the poem was the only thing in his head, and it would not leave, and he could not make it leave, and the duration was such that the certainty it would eventually end was not sufficient comfort against the immediate experience of it not having ended yet.

The Navy has used this recording for years.

It works because Kipling understood something about the relationship between repetition and consciousness that the military recognized, sometime in the twentieth century, as a tool. A poem written about the experience of being trapped in a loop became, itself, a loop that traps the people made to hear it.

There is a particular cruelty in the selection of this specific poem that is worth noting, though it is likely unintentional.

Boots contains a line — there’s no discharge in the war — that means, in the context of Kipling’s poem, that there is no release from the march, no end to the duty, no moment when the soldier is permitted to stop. In the context of SERE training, heard in a confined space in the dark on the hundredth iteration, it acquires a different quality. It sounds less like a description and more like a statement of fact about the immediate situation.

There is no discharge.

The poem continues.

You continue to hear it.

This is, presumably, the point.

One former SEAL described putting the recording on years after completing SERE, out of a combination of curiosity and the specific bravado of a man who has been through something difficult and wants to confirm, in the safety of distance, that it has lost its power.

He turned it off after thirty seconds.

He said the reaction was immediate and physical — not painful, not frightening in any way he could articulate, but viscerally, involuntarily aversive in a way that his body produced before his conscious mind had time to form a response to it. He said he couldn’t explain why his hands were shaking.

This is what sustained exposure to a carefully designed repeated stimulus, experienced under conditions of stress and sensory deprivation, produces in the human nervous system: a response that persists long after the conditions that created it have ended, that can be triggered years later by a few seconds of the original stimulus, that operates below the level of conscious control and cannot be reasoned away.

The Navy calls this training.

Kipling called it poetry.

The men who have been through it call it, consistently, the thing in SEAL training that they think about when people ask them what was the hardest part.

Not the cold water.

Not the sleep deprivation.

Not the physical tests that eliminated the majority of their class.

The poem.

Played again.

And again.

And again.

There’s no discharge in the war.

Try, try, try, try to think of something different.

Oh my God, keep me from going lunatic.

Boots, boots, boots, boots, movin’ up and down again.

👇👇👇

Full story · 12 min read · Dante Darkside

“He put it on years later to prove it had lost its power. He turned it off after thirty seconds. His hands were shaking. That is what SERE does.” — Reader, Virginia Beach VA “A poem written about being trapped in a loop became, itself, a loop that traps people. Kipling didn’t know. The Navy did.” — Reader, London “Not the cold water. Not the sleep deprivation. The poem. Every SEAL says the same thing. Why does nobody talk about this?” — Reader, San Diego CA “There’s no discharge in the war. In the context of that dark confined space, on the hundredth iteration. I need to sit with that.” — Reader, New York NY “The most effective psychological torture device costs nothing to produce and leaves no physical marks. That sentence.” — Reader, Chicago IL