The Army has awarded two contracts for a second phase in robotic mule prototypes -- one to American Rheinmetall Vehicles and another to HDT Expeditionary Systems, the service announced Tuesday. The contracts, worth a total of $22 million, task each company with building eight Small Multipurpose Equipment Transports, an unmanned robotic vehicle designed for lugging Army payloads and will act as a mobile power generator. The first increment of S-MET is a radio-controlled, eight-wheeled platform that can carry 1,000 lbs...