Under the power dome hood of the Chevrolet Colorado ZH2 fuel cell electric vehicle, the fuel cell system that has accumulated 3.1 million miles of real-world driving by civilian and military operators is ready for a year of extreme off-road testing as a U.S. Army demonstrator. General Motors and the U.S. Army Tank Automotive Research, Development and Engineering Center (TARDEC) revealed the vehicle at the fall meeting of the Association of U.S. Army show in Washington, D.C. on Monday (Oct. 3).