be factory-produced with the horizontal volute spring suspension (HVSS) with wider tracks to distribute weight; the smooth ride of the HVSS with its experimental E8 designation led to the nickname "Easy Eight", the vehicles were designated M4A3(76)W HVSS. Some E8s were equipped with the M101 howitzer. Both the Americans and the British developed a wide array of special attachments for the Sherman; few saw combat, and most remained experimental. Those that saw action included the bulldozer blade for the Sherman dozer tanks, Duplex Drive (DD) for "swimming" Sherman tanks, R3 flamethrower for Zippo flame tanks, and both the T34 60-tube Calliope 4.5" rocket launcher and T40 Whizbang 7.2" rocket launcher for the Sherman turret. The British variants (DDs, Firefly, Tulips, and mine flails) were among "Hobart's Funnies" of the 79th Armoured Division. The British Sherman Firefly was the most successful of these, incorporating the Ordnance QF 17-pounder into the Sherman's chassis. It was effective, especially against the more powerful German tanks like the Tiger, and over 2,000 of them were produced. M6 Heavy Tank The M6 heavy tank was a heavy tank built off of the similarly designed multi-turreted T1, armed with a 76.2 mm gun, a co-axial 37 mm gun, two .50 BMG M2 Browning and two .30-06 M1919 Browning machine guns, two in the hull and one on top of the turret. An order of 50 was placed and prototype vehicles saw trials but by the time it was ready for full-scale production the Army did not see any advantages over the M4 Sherman and planned production was cut from 5000 to 40. The M6 was declared obsolete in 1944 but was used in propaganda efforts. T14 Heavy Tank The T14 Heavy Tank was a joint US-British project to produce a well-armored tank that could equip both armies, armed either with the American 75 mm or British 57 mm 6-pounder gun. The British ordered over eight thousand in 1942 but by time the pilot was tested in 1944 they no longer had a need for it as the Churchill infantry tank had proven to be effective. M26 Pershing The M26 Pershing Heavy Tank came into service in 1945 under the designation of M26 Heavy Tank with the name "Pershing" named after General John J. Pershing, who commanded the U.S. Army during World War One. It was developed from the T20 Medium Tank which itself was an attempt at