Conceived at the height of World War II, the British Centurion and the Soviet T-55 were initially expected to counter the formidable Panther and Tiger tanks of Germany. But as the Cold War unfolded, these machines prepared instead for the coming struggle between NATO and the Warsaw Pact. Though they never fought in Europe, these two tanks became the mainstay of the Cold War's proxy forces around the world. From Korea to the Middle East and on to Angola,...