equipping itself with a new round of weapons to stop any attempts by iran to close the strait of hormuz. they have threatened to close it down which is a checkpoint for one fifth of the world's oil. peter doocy has more from washington. >> reporter: u.s. navy is adding guns to the destroyers and ships to counter any iranian fast boats or cruise missiles that might be used to close the strait of hormuz. also $100 million in the defense funds. the news coming about two weeks after the pentagon asked for $85 million more dollars for bunker buster bomb upgrades and one day after the international atomic energy agency says it has serious impersonates iran's nuclear program.