The U-2 is a single-engine, lightweight, high-altitude reconnaissance aircraft flown by the United States Air Force and the Central Intelligence Agency. It was designed in the 1950s by the renowned American aircraft designer and aircraft producer, Kelly Johnson of the Lockheed Corporation. The U-2 was originally developed as a high-altitude reconnaissance aircraft. Designed to fly above hostile air defenses and battlefields, the U-2 is able to survey wide areas quickly and accurately. It can operate day and night in virtually all conditions and its instruments can collect data from 65,000 feet. Its high-powered optics, advanced sensors, and an array of other sensors make it an essential reconnaissance tool for military planners. The U-2 has remained in service for over 60 years due to its unparalleled performance.