If you’d told a military historian ten years ago that Cold War-era tanks like the T-54, T-55, and T-62 would be back in action across Ukraine’s battlefields in 2025, they probably would’ve laughed.

The MBT-70, an ambitious joint U.S.-German tank project from the 1960s, was a technological marvel on paper but a practical failure. -Designed to be a revolutionary leap in armored warfare with ...