Ship-based system shoots down dummy missile from about 100 miles away . Aegis Ballistic Missile Defense has 23 successful tests in 19 tries , agency says . 23 CNN ships eventually will be equipped with system .
Ship-based system shoots down dummy missile from hundreds of miles away . Aegis Ballistic Missile Defense has 19 successful tests in 23 tries , agency says . More than 80 U.S. Navy ships eventually will be equipped with system .