The M103 heavy tank was America's last heavy tank, designed during the Cold War to counter Soviet behemoths like the IS-3. : A massive 120 mm M58 rifled gun.
: A 2023 documentary covering the M103's development and deployment until its retirement in 1974. Dod (103) mp4
If you are looking for a "long post" or comprehensive video review, these are the most authoritative sources: The M103 heavy tank was America's last heavy
: A detailed look at the tank's armor specifications and engine mechanics . Dod (103) mp4