More than 10,000 U.S. troops enforce Iran blockade

April 17, 2026

Summary

U.S. military officials said more than 10,000 troops are enforcing an Iran blockade, with 14 ships turning back and no boardings yet.

Why this matters

The story shows the scale of U.S. military operations around Iran and the potential for escalation in a vital shipping region. It also highlights possible risks to global energy and maritime trade routes.

More than 10,000 U.S. troops are helping enforce a blockade on Iranian ports, and no ships have been boarded so far, the military said Thursday.

Some Iran-linked or sanctioned vessels that left the Persian Gulf through the Strait of Hormuz appeared to stop, switch off radio transponders, or head back toward Iran’s coast, according to shipping data firms.

The blockade is being enforced in Iran’s territorial seas and international waters, not in the Strait of Hormuz. Vessels that approach it are warned, Gen. Dan Caine, chairman of the Joint Chiefs of Staff, told reporters at the Pentagon.

“Any ship that would cross the blockade would result in our sailors executing pre-planned tactics designed to bring the force to that ship — if need be, board the ship and take her over,” he said.

U.S. Central Command released a recording of a radio message sent to vessels in the region saying the military was prepared to use force if needed to compel compliance.

“Vessels will be boarded for interdiction and seizure transiting to or from Iranian port,” the message said.

Defense Secretary Pete Hegseth said “less than 10% of America’s naval power” was being used to enforce the blockade. The Navy has 16 warships in the Middle East — 11 destroyers, three amphibious assault ships, an aircraft carrier, and a littoral combat ship — out of a battle force of about 300 warships.

Aircraft, surveillance, reconnaissance, and intelligence operations are also supporting the naval effort.

Caine said the effort extended beyond the Middle East, with U.S. military assets in other regions, including the Pacific, set to pursue vessels that illegally ship Iranian oil or provide material support to Tehran.

He also described heavy maritime traffic near the blockade.

“There is a lot out there,” Caine said. “It is like driving a sports car through a supermarket parking lot on a payday weekend, with thousands of kids in that parking lot, as you attempt to maneuver through there to get to that ship that would attempt to run that blockade.”

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