The Fundamental Instrument
“Man is the fundamental instrument of war. Other instruments may change, new weapons may be created and new modes of defense may be devised, but man, the fundamental instrument, remains constant.”
The US Army wrote that line six years after Hiroshima - US Army Field Manual 22-10, Leadership, March 1951. The atomic bomb had just rewritten what war meant, and the people responsible for training officers sat down and decided the most important thing to say about leadership was that the human being remained the point. Every weapon was an instrument. The soldier was the instrument. One was constant. The other was not.
I think about this passage often, lately, when people ask me what AI is for.
The dominant answer — the one shaping how most organisations are deploying these tools — is that AI is for producing more. More copy, more code, more decks, more emails, more reports per analyst per quarter. Output as the metric. Velocity as the virtue. The human reduced to a quality-control checkpoint between machine generation and machine consumption, scrolling past LLM-written prose to approve it for an audience that will feed it back into another LLM to summarise.
This is the slop economy. And the test for whether you’re in it is not whether you’d put your name to the work. The test is sharper than that: have you understood what you are saying?
Most of the time, the honest answer is no. You have produced something. You have not understood it. You are a meat link in a chain that runs from one model’s output to another model’s input, and your contribution is a rubber stamp. The Army would have a word for this. The word is not flattering.
There is a different way to use these tools, and the 1951 field manual points straight at it.
Principle IV of military leadership, per FM 22-10: Keep your men informed. The reasoning is operational, not sentimental. “The soldier who is well informed about the mission and situation and about the purpose of his particular task is considerably more effective than the one who is not so informed. The better he is informed, the better he can perform his tasks with maximum initiative.” The uninformed soldier, by contrast, performs “blindly without purpose.”
Read that with one substitution. Replace soldier with knowledge worker. The argument holds exactly. The informed human acts with initiative and judgement. The uninformed human executes blindly. The bottleneck on quality work has never been how fast you can produce; it has always been how well you understand the terrain you are producing for.
LLMs, used properly, are the most powerful instrument for informing the human that has ever existed. They can read a sector’s worth of submissions and tell you what is actually being argued. They can synthesise a regulatory landscape, surface the weak signals in a discourse, map a field of research, summarise forty stakeholder interviews, identify the contradiction nobody on your team has named yet. They are an extraordinary horizon-scanning instrument — a discipline strategic foresight has practised for decades, suddenly tractable at a scale no human team could match.
This is the use that pays off. Not the LLM as ghostwriter. The LLM as scout. The machine reads so the human can think. And the human, better informed, produces work of greater depth, greater insight, and greater authorship than they could have managed alone.
The human remains the fundamental instrument. The LLM is one of the other instruments — powerful, novel, worth taking seriously. But an instrument, in service of the thing that does the understanding.
Get this the wrong way around and you have built a system where the machine creates and the human approves. The output goes up. The understanding does not. The organisation gets faster at producing material nobody fully grasps, addressed to audiences nobody has truly considered, in service of decisions nobody has thought through. You will feel productive. You will be hollowing out.
Get it the right way around and the human walks into every meeting, every brief, every decision better informed than they could possibly have been five years ago. They write less but say more. They produce less volume and more signal. They are, in the most precise sense, the leader the field manual was describing — the one who can perform their task with maximum initiative because they have been kept informed.
The instrument is changing again, as it always does. The question is whether you’ll use it to make the fundamental instrument sharper, or to pretend it can be replaced.
The Army worked this out in 1951. We should be able to manage it in 2026.
— G
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