Turning a fighter into a bomber may seem like trying to convert a Honda S2000 roadster into a pickup truck. Fighters, which are designed to dogfight with hostile airplanes and perform short-range attack missions, are fast and agile; bombers are made to haul heavy loads for thousands of miles. But Lockheed Martin is designing a fighter-bomber hybrid based on the F-22 Raptor fighter that's in flight-testing at Edwards Air Force Base in California.