The Hybrid-Electric Humvee has a diesel engine and electric motor generator which are combined to create a series hybrid that uses two traction motors to drive the front and rear axles.The system has the capability to allow the user six hours of silent watch and up to six miles of silent mobility using its battery system. Additionally, this vehicle can export up to 30 kW of power to external sources.The theme of this year's Society of Automotive Engineers 2009 World Congress in Michigan this week is "Racing to Green Mobility," and U.S. Army Tank Automotive Research, Development and Engineering Center's display features alternative energy sources it has been developing.