Lockheed Martin and Kaman Aerospace , a subsidiary of Kaman of Bloomfield, Conn., have teamed to market advanced manned and unmanned helicopters worldwide for government applications. The companies intend to develop an unmanned version of the K-Max, already FAA approved for manned operation. The K-Max, with counter-rotating and intermeshing rotors that eliminate the need for a tail rotor, has accumulated more than 200,000 flight hours.