According to The Independent, Hegseth did not specify which rules he considered "stupid" or what changes would be implemented. But the implications are troubling. If the U.S. military relaxes targeting standards, accepts higher levels of collateral damage, or reduces protections for prisoners, it would violate international law and set a precedent that adversaries would eagerly exploit.

The reaction from international law scholars has been swift. Mary Ellen O'Connell, a professor at the University of Notre Dame Law School and expert on international humanitarian law, told reporters that Hegseth's comments were "profoundly irresponsible" and suggested a "fundamental misunderstanding of why these rules exist."

"This isn't about political correctness," O'Connell said. "It's about preventing war crimes. If the United States abandons these principles, we lose any standing to condemn others who do the same."

The concern extends beyond legal abstractions. If U.S. forces operate with looser rules of engagement, civilian casualties in Iran will almost certainly increase. That, in turn, will strengthen the regime's narrative that America is waging war on the Iranian people, not just the government. It will complicate any post-conflict stabilization and make it harder to build support for a successor government.

There are also practical military considerations. American commanders have long argued that strict adherence to rules of engagement, while sometimes frustrating in the short term, enhances operational effectiveness in the long term. Minimizing civilian casualties reduces the enemy's ability to recruit, maintains local support, and preserves the moral legitimacy that is critical to sustained military operations.

When the U.S. military abandoned these principles—or was perceived to have done so—in Iraq and Afghanistan, the results were disastrous. The Abu Ghraib scandal, in which American soldiers tortured and abused Iraqi prisoners, became a recruiting tool for insurgents and undermined years of efforts to win over the Iraqi population. Senior military leaders, including then-General David Petraeus, later identified the incident as one of the most damaging setbacks of the war.

If Hegseth's comments reflect actual changes in operational guidance, they could have strategic consequences beyond the current conflict with Iran. Russia and China, both of which have been accused of war crimes in Ukraine and Xinjiang, would seize on any American departure from international humanitarian law to argue that the rules-based order is a hypocritical fiction.

Allies, too, are watching. Several European nations have already declined to participate in the Iran operation, citing concerns about its legal basis. If the U.S. further distances itself from established legal norms, that reluctance will deepen. Britain, Germany, and France all place heavy emphasis on compliance with international law in their military operations; they will not associate themselves with a campaign that visibly violates those standards.

The Pentagon itself may resist implementation of looser rules. The U.S. military's legal corps—the Judge Advocate General (JAG) officers embedded at every level of command—are trained to ensure compliance with the laws of armed conflict. Commanders who authorize strikes that violate those laws can face court-martial. That structure exists precisely to prevent political leaders from ordering illegal actions.

But Hegseth's comments suggest the administration may view those legal constraints as obstacles to be removed rather than protections to be upheld. If the Defense Secretary is signaling that JAG advice should be ignored or overruled, it places military commanders in an impossible position: follow the law and risk career consequences, or violate the law and risk prosecution.

The phrase "no stupid rules of engagement" may play well with certain domestic audiences who believe American military power has been excessively restrained. But in the context of an active conflict, it is an invitation to excess—and a warning that this administration does not intend to be bound by the legal and moral constraints that have governed American use of force since World War II.

The question now is whether the Pentagon will translate Hegseth's rhetoric into actual changes in operational guidance. If it does, the consequences will extend far beyond Iran. The laws of armed conflict exist not just to protect adversaries, but to protect the humanity of those who fight. Abandoning them is not strength—it is a path to moral and strategic failure.