More: "Never in recorded history has a nation's military been so quickly and effectively neutralized," Secretary of Defense Pete Hegseth claimed on March 26. The next day, Iran launched a drone and missile attack on an American base in Saudi Arabia that wounded more than a dozen service members, destroyed a radar surveillance plane and damaged at least two refueling tankers.

The immediate debunking of Mr. Hegseth's bombast points to the reform agenda that America's military needs. There are four main priorities.

First, the United States needs to invest in counter-drone technologies, like those that Ukraine has developed in its war against Russia. The lack of such defenses is one reason that the vaunted U.S. Navy has been unable to prevent the closure of a vital waterway, the Strait of Hormuz.

Second, the United States needs more of its own cheap, disposable weapons like one-way attack drones and unmanned ships. Although much of the war in Ukraine has been fought by mass-produced drones, the Pentagon is pouring money into much more complex equipment, including pilotless "wingmen" that can fly alongside a piloted plane.
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Third, the country needs larger and more flexible industrial capacity. Until recently, a single factory made all of America's Tomahawk cruise missiles, and there is a constant shortage of Patriot missile interceptors. Congress should pass laws that help the private sector build up its manufacturing capacity. The Pentagon, for its part, needs to stop buying so many of its weapons from just five big weapons makers and start betting on dynamic tech companies that can quickly adapt.

Lastly, the United States needs to collaborate with other industrialized democracies. Mr. Trump's pleas for help in reopening the Strait of Hormuz from the very allies he spurned at the start of the war is just the latest proof that America can't go it alone. In the years ahead, keeping pace with China's economic and military expansion will require collaborating with like-minded democracies.

All of these steps are not merely about winning the next war. They also can help prevent it " by making our enemies believe they would lose any war they start.

Instead, the war in Iran has provided a road map for any country that wants to resist the United States in the future, including Russia and North Korea. For China, the country with the greatest potential to challenge American military might, the war validates its focus on new forms of warfare such as drones and cyber and space power.