The objective of the Hybrid Electric Vehicle Experimentation and Assessment (HEVEA) research program is to develop Hybrid Electric Vehicle (HEV) Fuel Economy and performance Test Operating Procedures (TOP), determine the fuel economy benefits of HEV using quantifiable test data; develop and validate TARDEC M&S models; and provide a tool to predict hybrid electric drive cycle performance and fuel economy. TARDEC has tested 9 conventional and 7 hybrid electric vehicles. DTC (US Army Developmental Test Command) maintains primary-road, secondary-road and level and hilly cross-country test courses for natural environment endurance testing of vehicles in the temperate climate of Aberdeen Proving Ground, MD. The Munson Test Area, located at the U.S. Army Aberdeen Test Center, contains 30 all-weather permanent courses designed to evaluate performance and measure physical characteristics of wheeled, tracked, and towed vehicles. Courses include various obstacles, shock and vibration courses and slopes up to 60 percent.