WASHINGTON — With one field experiment under its belt, the Pentagon’s research and development agency began a second round of off-road testing for its autonomous vehicle program, this time turning to the steep hills of central California. The Robotic Autonomy in Complex Environments with Resiliency, or RACER, project aims to develop autonomous uncrewed ground vehicles to maneuver in unstructured off-road terrains. This round of testing began last week at Camp Roberts, located midway between Los