A US Navy destroyer opened fire on an Iranian-flagged cargo vessel's engine room in the Strait of Hormuz over the weekend, a rare use of force that shows how far the US is willing to go to enforce its blockade on Iran. Loading audio narration... US forces routinely train to escalate from warnings to disabling fire, but they almost never have to carry it out in sanctions enforcement. The strike on the ship is a rare case where that playbook moved from training to reality.