At the height of the Cold War, the Americans and the Russians held a secret meeting to determine which nation had the bravest troops. The challenge took place on a cliff in Finland, hundreds of feet above a sheer drop into a raging river. The American soldier was first to step forward. "Private Miller," barked his platoon commander, "march to the edge of the cliff." Private Miller saluted, and briskly marched to the very edge of the cliff. "Private Miller! Jump!" shouted the commander. But Mille…