Daniel Lloyd, Lockheed Martin Skunk Works, prepares the unmanned air system Stalker XE for a flight during exercise Steel Knight aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Nov.28, 2017. The Combat Center invited Lockheed Martin to participate in exercise Steel Knight to develop teaming tactics, techniques and procedures with manned and unmanned air systems.(Marine Corps photo by Cpl. Devin Andrews) - Daniel Lloyd, Lockheed Martin Skunk Works, prepares the unmanned air system Stalker XE for a flight during exercise Steel Knight aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Nov.28, 2017. The Combat Center invited Lockheed Martin to participate in exercise Steel Knight to develop teaming tactics, techniques and procedures with manned and unmanned air systems.(Marine Corps photo by Cpl. Devin Andrews)