Lockheed’s U-2 spy plane was one of the most iconic aircraft of the Cold War and played a prominent role in the Cuban Missile Crisis of 1967. Today, it is one of the oldest aircraft still in US Air Force service, having first flown in 1955 and entered service in 1956. It was designed to be hard to detect and to be a high-altitude reconnaissance aircraft. U-2s remain in service and are now the Air Force’s only manned high-altitude ISR platform.