The city's nickname is ""The Rocket City"" for its close history with U.S. space missions. Huntsville has been important in developing space technology. Since the 1950s, when the German scientists headed by Wernher von Braun, brought to the United States at the end of World War II through Operation Paperclip, managed to develop rockets for the U.S. Army. Their work included designing a rocket, that carried the first U.S. satellite and astronauts into space.