T5E1 gun, in a ball-shaped gun mantlet set into the vertical hull front. The traverse was limited to 10° right and 11° left, and elevation from 19.5° to −5°. When traveling, the gun was locked at the maximum elevation. The only other armament was a .50 cal. (12.7 mm) M2 Browning machine gun on a ring mount above the commander's hatch for anti-aircraft use. The main gun—65 calibres long—had a muzzle velocity of 3,700 feet per second (1,130 m/s), with a range of up to 12 miles (19 km). The armor was very thick compared to other tanks of the time, up to 12 inches (305 mm) thick on the front. This was considered heavy enough to provide protection from the German 88 mm gun used as tank and anti-tank guns. The lower hull front had 5.25 in (130 mm) of armor, and the sides 2.5 in (64 mm). The suspension system and lower hull were covered with 4-in (100 mm) thick steel skirts. The engine was a gasoline-powered Ford GAF V-8, delivering 500 hp, at 2600 rpm through the Torqmatic transmission; which left the vehicle underpowered, geared down to a top speed of about 8 mph (13 km/h) and greatly limited its obstacle-climbing capability. Surviving vehicle In 1974, the last prototype was discovered abandoned in a field at Fort Belvoir, Virginia. Camouflaged in the middle of some bushes, it is unknown where it spent the intervening 27 years. It is the sole remaining example of these tanks and was exhibited at the Patton Museum of Cavalry and Armor in Kentucky. In 2011, it was shipped to its new home at Fort Benning, Georgia. It was placed in the new Patton Park, which is a plot of 30 acres where nine of the tanks being stored at Fort Benning are now displayed. The vehicle was damaged in January 2017 during transit to another facility for external refurbishment when it broke loose from the M1070 HET carrying it. The transporter failed to negotiate a downhill slope and subsequent turn at a safe speed, causing the securing chains to break and allowing the T28 to slide off the trailer. Despite then rolling into a ditch, only minor repairable damage was sustained to two bogies. The outer track units had been removed. Photos See also List of U.S. military vehicles by model number Tank classification Jagdtiger – a comparable German vehicle for anti-tank