Soldiers inspecting new trackless tank during demonstration at Fort Myer, Virginia. Tank was manufactured by the Trackless Tank Corporation of New York, and submitted to the Ordnance Department, U.S. Army, for inspection. Preliminary tests indicate that the tank may be adaptable for reconnaissance purposes, possibly replacing scout cars. Tank weighs 10 tons. During initial, brief tests at Fort Knox, Kentucky, it made 45 miles an hour across rough country, with a 37 mm gun and two machine guns mounted in its turret; its designer says it can travel 85 mph on level ground. It is powered by a 250 horsepower diesel engine, and carries 1/2-inch armor. Tentative plans of the Army call for a redesign of the superstructure for better arming of the tank