On the heels of World War II, the jet airplane became a defining piece of mid-20th-century technology that would revolutionize existing airplane roles and create an entirely new generation of mission-specific machines. With the world in the grip of the Cold War, combat planes became faster and more agile, spy planes cruised over enemy territory at dizzying heights and dazzling speeds, and jet-powered helicopters entered military service. Designers, test pilots and combat crews took huge risks as they pushed the technological envelope, and within 58 years of Orville Wright's historic flight at Kitty Hawk, man had broken through the boundaries of both sound and space.