Should the U.S. military replace the M1A2 Abrams Main Battle Tank or keep upgrading it? So far, the supporters of upgrades have won out.
The modern M1A2 has been improved so much that it hardly resembles the original tank on the inside. Proponents are calling it the most technologically advanced tank in the world. But it requires a long testing cycle. This year the Abrams M1A2 had to show its mettle by driving 2,000 miles in sub-Arctic weather to prove it can operate in the cold.