The Constitution class U.S.S. Enterprise is one of the most celebrated ships in the history of space travel, and the flagship of Earth's Starfleet. It had been in service for nearly two decades before it set off on its groundbreaking five-year exploratory mission, which made the Enterprise a legend in its own time. Undergoing multiple refits to remain top-of-the-line, it served for 40 years before its ultimate destruction, and its name lives on in the next generation of starships.