The Navy will fire the electromagnetic railgun for the first time at sea from the fifth Joint High Speed Vessel, the Trenton, in a demonstration next summer, according to the program manager. Capt. Michael Ziv, railgun program manager, announced the selection of the Trenton for the at-sea demonstration April 14 at the Navy League's Sea-Air-Space exposition. During the demonstration, the railgun will fire a GPS-guided Hyper Velocity Projectile at a fixed over-the-horizon target, Ziv said. The test will validate system...