Iran’s paramilitary Revolutionary Guard fired a missile from a helicopter targeting a replica aircraft carrier in the strategic Strait of Hormuz, state television reported on Tuesday, an exercise aimed at threatening the U.S. amid tensions between Tehran and Washington. The drill, in a waterway through which 20% of all traded oil passes, underlines the lingering threat of military conflict between Iran and the U.S. after last summer saw a series of incidents targeting oil tankers in the region. In January, a U.S. drone strike killed a top Iranian general in Baghdad and Tehran responded by firing ballistic missiles targeting American forces in Iraq.