Raytheon received Experimental Airworthiness Certificates from the FAA for three of its Cobra Unmanned Aircraft Systems, the company said Thursday. The certification, Raytheon said, permits Cobra flight operations in a specified section of Southeastern Arizona. It also authorizes Raytheon to conduct research and development, crew training and market surveys using the Cobra system. The certification brings Raytheon’s certified Cobra fleet total to five. The Cobra test bed will be used to support the development, test and demonstration of sensor systems; networked command, control and communications systems; and unmanned aircraft system architectural concepts.