The U.S. military has boarded another commercial vessel during blockade of Iran 's ports, but unlike in previous cases, the ship was ultimately allowed to carry on its way. U.S. Central Command said on social media that Marines boarded the Blue Star III on Tuesday but “released the vessel after conducting a search and confirming its voyage would not include an Iranian port call.” An accompanying video showed American forces fast-roping from a helicopter onto the vessel. The Blue Star is at least the fourth merchant ship to be boarded since the Trump administration began the blockade of Iranian shipping more than two weeks ago, but it is the first to not be taken into U.S. custody. The U.S. blockade aims to squeeze Iran amid a ceasefire in the war as Tehran's cutoff of the Strait of Hormuz , a crucial waterway for energy shipments, ripples across the global economy. Data from ship tracking websites shows that the Blue Star departed the Pakistani port of Qasim and was en route to the port of Sohar, Oman.…