M103 Heavy Tank Was Built to Fight Russia (But Never Did)

What You Need to Know: The M103 was a heavy tank developed by the United States in the 1950s to counter Soviet heavy tanks like the IS-3 and IS-4. Weighing 62 tons and equipped with a powerful 120mm main gun and up to five inches of front hull armor, the M103 was designed for direct engagement with enemy heavy tanks.

-However, its massive size led to significant drawbacks, including a low top speed of just 21 miles per hour and a limited range of 80 miles, making it unsuitable for rapid movement or long-distance operations.