At first glance, there was nothing special about the blimp floating high above the cars and crowd at this year's Indy 500 on Memorial Day weekend. Like most airships, it acted as an advertising vehicle; this time for the Fisher House, a charity focused on helping injured veterans and their families. But the real promo should have been for the blimp's creator, Raytheon, the security company best known for its weapons systems. Hidden inside the 55-foot-long white balloon was a powerful surveillance camera adapted from the technology Raytheon provides the U.S. military. Essentially an unmanned drone, the blimp transmitted detailed images to the race's security officers and to Indiana police. "The airship is great because it doesn't have that Big Brother feel, or create feelings of invasiveness," says Lee Silvestre, vice president of mission innovation in Raytheon's Integrated Defense division. "But it's still a really powerful security tool."