The United States unveiled sweeping sanctions Tuesday against almost 50 individuals and companies it says were part of a “shadow banking” network that moved billions of dollars for Iran’s military. The sanctions target a network of Iranian exchange houses and foreign firms that enabled Iran’s defense ministry and Islamic Revolutionary Guard Corps (IRGC) to disguise revenues generated abroad, the Treasury Department said in a statement. Revenue was used to procure and develop advanced weapons systems like unmanned aerial vehicles (UAVs), and also fund regional proxies including Yemen’s Houthi r…