The British-made Centurion tank was first developed in 1945 but came much too late to be used in World War II. The British needed a larger, heavier version of the Comet. The Centurion also had sloped armor and a more powerful main turret.
The tank was also an effective deterrent in postwar Western Europe. NATO planners saw it as a perfect counter to the Russian T-34. The Centurion served in the Korean War, a dominant partner in the UN forces' breakout from Pusan. The tank operated in the subzero temperatures and even on the tops of mountains. Australians in the Vietnam War also used it, as did India and Pakistan (their wars pitted Centurion tanks against other Centurion tanks), Sweden, South Africa, Jordan, and Israel. The British used the Centurion through the 1991 Gulf War.
The Nuclear Test
Besides powering through the high mountains and subzero temperatures in North Korea and fighting through the dense, sweltering jungles of Vietnam, the biggest testament to the Centurion's toughness came in Australia in 1953. An Australian Army Centurion Mark 3 was left at ground zero of a 9.1 kiloton nuclear detonation -- engine running and loaded down with ammo, supplies, and a mannequin crew.
When test crews inspected the tank after the blast, they found the vehicle intact, if heavily sandblasted. The only reason the engine stopped was because the tank ran out of fuel. While the blast wave would have killed a real tank crew at that distance from the epicenter, the researchers realized they could have driven the tank off the test site.
The actual tank that withstood the nuclear blast, naturally nicknamed The Atomic Tank, was used by the Australians in the Vietnam War. It took an RPG and stayed in the fight during an engagement with the North Vietnamese.
Israel, Jordan, Libya, and South Africa still use variants of the Centurion today.