Starfleet sent starships on five-year missions for exploratory purposes. Favored for five-year missions were explorers, both light and heavy, in both the 23rd century and the 24th century.
The Romulan Tal Prai'ex oversaw one five-year mission in the 2380s, conducted under Annika Hansen at the command of the RIS Bouteina. (RIS Bouteina)
Ships that took part in five-year missionsEdit