Inspired by achievements of an amphibian tractor of his own invention, Donald Roebling has designed a monster land-and-water war tank, a working model of which is being built for the United States at a cost of $25,000. Plans call for a juggernaut capable of carrying forty soldiers and 7,000 pounds of equipment at twenty-five miles an hour over land and eight ana one-half miles an hour on water. One possible use for the amphibian might be the transfer of troops from ships to the shore. The “alligator” tractor was constructed for rescue work in flooded areas, for sightseeing in the Florida Everglades and for travel through swamps.