Engineer Paul Green wheels his company's new fully armored combat vehicle over the clay roads and muddy streambeds of the South Carolina backcountry, guns the engine and races over one hill and then the next. "This is designed to be what we thought would be a step up from the Humvee," he shouts as he shifts gears. "This vehicle was never designed to be a direct replacement for the current armored Humvee." But the prototype -- christened the MUV-R (Mine-protected Utility Vehicle/Rapid Deployable) by its manufacturer, Charleston, S.C.-based Force Protection, Inc. -- may well be.