The Douglas C-47 Skytrain is a military transport that was developed from the Douglas DC-3 airliner. The C-47 was famous for its dependability, versatility, and ability to carry loads far heavier than the official specs allowed. Famous campaigns involving the C-47 were "flying the Hump" (transport over the Himalyas), dropping paratroops behind enemy lines on D-Day, and the post-war Berlin airlift. The C-47 was so useful that it was used by the U.S. military in WWII, Korea, and Vietnam, and many are still flying in different countries around the world today.