The U.S. is surging firepower to the Middle East as President Trump ramps up pressure on Iran over its nuclear program. The U.S. has 12 warships in the region, including the USS Abraham Lincoln that is armed with F-35C and F-18 fighter jets. On land, the U.S. has bases and installations across the Middle East and coordinates with its ally, Israel. WSJ’s Shelby Holliday explains the massive U.S. military build up in the region and how Washington is preparing for potential Iranian retaliation.