use. Entered limited production. Tortoise heavy assault tank – a comparable British vehicle for attacking fortifications; only six built. SU-100Y Self-Propelled Gun - a comparable Soviet vehicle for attacking fortified bunkers; only one built. Notes Hunnicutt R. P., Firepower: A History of the American Heavy Tank. Presidio. External links "This Lumbering Monster Is Newest Antique", January 1946, Popular Science T28 Super Heavy Tank (Gun Motor Carriage T95) Self-Propelled Gun / Heavy Tank (1945) Reassembling the Last U.S. T28 Super Heavy Tank. https://www.youtube.com/watch?v=E0a5oMl2fX8 Abandoned military projects of the United States Super-heavy tanks World War II tank destroyers of the United States World War II tanks of the United States History of the tank Trial and research tanks of the United States