“I don’t have the yips with respect to boots on the ground,” Donald Trump told the New York Post this week. Referring to Iran, he added that while he probably doesn’t need them, he would deploy ground troops “if necessary.”

With those words, the administration cracked open a door most American strategists hoped was bolted shut by half a century of hard lessons.

Modern American military history is a graveyard of campaigns that began with overwhelming tactical success and ended in strategic failure.

Operation Epic Fury, the joint U.S.-Israeli campaign, has already delivered what hawks in Washington have wanted for decades: the decapitation of Iran’s top leadership. The strikes that killed Ali Khamenei were meant to trigger a rapid collapse of the Islamic Republic. Early evidence points to something messier — and more dangerous.

The fundamental flaw in the administration’s logic is simple: Removing a leader does not remove a regime.

Khamenei is dead, but the Iranian state remains. A temporary leadership council has already formed. The Islamic Revolutionary Guard Corps still holds the monopoly on force. Worse, strikes that reportedly killed hundreds of civilians — including more than 100 children in Minab — handed the regime a fresh narrative. Instead of a unified, pro-Western uprising, many Iranians are responding with nationalist anger and a predictable desire for revenge.

That reality should end any talk of “finishing the job” with a ground invasion.

Modern American military history is a graveyard of campaigns that began with overwhelming tactical success and ended in strategic failure. Vietnam. Afghanistan. Iraq. In each, the “mission accomplished” moment became the prologue to years of insurgency, political collapse, and sunk costs.

In Vietnam, the U.S. won battles and lost the country because it could not produce a legitimate political alternative.

In Iraq and Afghanistan, trillion-dollar investments in nation-building crumbled once American security guarantees lifted.

If the United States shifts from air strikes to a ground presence in Iran, it will collide with problems it cannot solve.

Start with geography and scale. Iran is a country of nearly 90 million people, with mountainous terrain that functions as a natural fortress. A serious occupation would require a troop commitment the American public will not support — and it would likely exceed anything seen in Iraq.

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Photo by Brendan SMIALOWSKI / AFP via Getty Images

Then comes the legal and constitutional crisis at home. Trump has prosecuted this war without a formal declaration — and without meaningful consultation with Congress. That bypasses the democratic safeguard meant to force elected representatives to weigh blood and treasure.

Escalating to a ground war on such a foundation invites a domestic political firestorm, fracturing the country at the very moment unity matters most. Disregard for constitutional norms does not merely weaken the rule of law; it undermines the legitimacy of the mission.

Next, look at the internal politics of Iran. The administration appears to hope Iran’s grievances can be leveraged against the regime. History suggests the opposite. Foreign boots on the ground almost always unify a population against the invader. An invasion would turn a struggle for internal reform into a war of national liberation and hand hardliners their best recruiting tool.

The anger in Tehran is not necessarily pro-regime. It is a primal response to foreign violation.

Finally, consider the regional fallout. The “Axis of Resistance” has already begun responding — drone activity, base attacks, threats to shipping and energy flows through the Strait of Hormuz. Six U.S. service members have already died in retaliatory strikes. A ground invasion would expand the conflict into a full regional war, drawing in proxies and potentially major powers into a fight Washington cannot afford and cannot control.

A ground invasion would not be brief, as Pete Hegseth has suggested. It would become a generational entanglement.

Washington can destroy targets. It cannot manufacture a stable, pro-Western political order at the point of a bayonet. Ignore the failures of the past and you guarantee a disaster in the future.