The American built Douglas C-47 Dakota was adapted from the DC-3 Dakota commercial airliner. It was named the Douglas C-47 Skytrain by the US Army, designated the R4D by the USN, and was commonly referred to as "Gooney Bird" by American troops. It was one of the most successful aircraft designed and built, and had great longevity. The last C-47 was retired from the American Air Force in 1975, however they continue to see commercial service all over the world.