MOODY AIR FORCE BASE, Georgia (Reuters) - The U.S. Defense Department on Wednesday unveiled what it called a revolutionary heat-beaming weapon that could be used to control mobs or repel foes in conflicts like Iraq and Afghanistan. The so-called Active Denial System causes an intense burning sensation causing people to run for cover, but no lasting harm, officials said. "This is a breakthrough technology that's going to give our forces a capability they don't now have," Theodore Barna, an assistant deputy undersecretary of defense for advanced systems and concepts, told Reuters. "We expect the services to add it to their...