Five-year mission

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 at the command of the RIS. 

Ships that took part in five-year missions

 * Federation
 * USS Arcturus (NCC-1807)
 * USS Avenger (NCC-1860)
 * USS Constitution (NCC-1700)
 * USS Diponegoro (NCC-5322)
 * USS Enterprise (NCC-1701)
 * USS Galaxy (NCC-70637)
 * USS Hannibal (NCC-512)
 * USS John Ross (NCC-811)
 * USS Retribution (NCC-2017)
 * USS Ronin (NCC-34523)
 * USS Scorpio (NCC-1590)
 * USS Yorktown (NCC-1717)
 * Romulan Star Empire
 * RIS Bouteina