Four vehicle concepts have been developed to traverse the twilight zone and increase mobility in marginal terrain. These vehicles have a low ground bearing pressure and shallow draft. They were designed to transport three men and their equipment, have a limited range and life expectancy, and be inexpensive. Each vehicle has frontal armor protection from small arms fire and is designed to be carried internally in the CH-47 helicopter. The four vehicle concepts have undergone a feasibility test over various types of terrain and exhibited enough mobility to warrant modification and retesting to obtain additional performance data on the various drive configurations.