The Strait of Hormuz, a narrow waterway at the mouth of the Persian Gulf, handles around 26% of the world’s oil trade and is rarely far from the center of global tensions.

Pentagon officials are trying to prepare for all of the ways Iran could retaliate, as President Trump hints at what he might do.

Iran has in the past threatened to close the critical Strait of Hormuz to traffic in retaliation for Western pressure. Any closure of the strait could restrict trade and affect global oil prices. In the latest measure,