Iran's 'mosquito fleet,' a collection of fast-attack boats, remains a formidable challenge to the US Navy in the Strait of Hormuz, a vital chokepoint for global oil transport. This fleet, consisting of 500 to 1,000 operational boats, is part of the Islamic Revolutionary Guard Corps (IRGC) and has been developed as a strategy of asymmetric warfare since the Iran-Iraq war in the 1980s. Despite US President Donald Trump's claims of having destroyed Iran's conventional navy, experts indicate that the IRGC's capabilities, particularly its mosquito fleet, remain largely intact. The US military has deployed significant naval resources in the region but has struggled to reopen the strait, which typically sees about 20% of the world's oil supply. Recent US operations have targeted these fast boats, but analysts suggest that Iran's tactics and geographical advantages complicate American efforts. The ongoing presence of these boats not only affects maritime security but also drives up shipping insurance costs, as the IRGC can create enough uncertainty to deter shipping traffic. The situation underscores the challenges faced by the US Navy in maintaining control over this critical maritime route.