LIVERMORE, Calif. (AP) - Officials at Lawrence Livermore National laboratory have added a new weapon to their armory, a high-powered gun that can fire 3,000 rounds a minute. The weapons, which are also to be installed at other facilities in the Energy Department complex, were displayed Thursday by Linton Brooks, head of the National Nuclear Security Administration. Brooks called the new weapons a way to make sure any attempt to storm the nuclear weapons lab is unsuccessful. "What we want to do is equip our protective force with the capability that will leave no doubt about the outcome," he said....