WASHINGTON (Reuters) - The Pentagon says it plans to use a sea-based missile to shoot down a mock warhead over the Pacific today for the first time since a botched drill last June. The Missile Defence Agency said a "hit-to-kill" missile fired from the U.S. Navy Aegis cruiser USS Lake Erie on Thursday would try to intercept a dummy warhead fired from the Pacific Missile Range Facility on Kauai in the Hawaiian islands. It would use information relayed by the destroyer USS Russell, sometime after 5 p.m. Britisht time, the agency said. Chris Taylor, a spokesman for the agency, said...