USS Valiant ( 23rd century ) The USS " Valiant " was a 23rd century Federation star cruiser operated by Starfleet . ( ) History . In 2217 , USS " Valiant " was lost while exploring star cluster NGC 321 . The ship made first contact with the principal planet of an unnamed star system , Eminiar VII . While in orbit , the " Valiant " was warned to leave the system , but was " attacked " and subsequently declared a casualty in the war with neighboring Vendikar . The " Valiant " and the Earth expedition making the report failed to return from its mission . The ship ' s disposition was listed as " missing in space " . In 2267 , on stardate 3192 . 1 , the was sent on a similar mission , only this time to open diplomatic relations with Eminiar VII . It was at this time that the fate of the " Valiant " was discovered . ( ; ) Appendices . Background information . It should be noted that the designation " star cruiser " is one given by Anan 7 of the Eminian High Council in dialogue and then in reference to the USS " Enterprise " only . It is therefore assumed that " Valiant " was likewise designated by his predecessors . According to the reference book " Star Trek Spaceflight Chronology " ( p . 152 ) , USS " Valiant " had the registry NCC - 1102 , whereas the listed the registry of the " Valiant " as NCC - 1223 . The prior 1997 edition of the " Encyclopedia " stated that " Valiant " was a starship , but that note was removed from later editions presumably due to the fact that , in , Data mentioned that " Daedalus " - class vessels were taken from service years before the " Valiant " s mission to NGC 321 . The first , 1994 edition of the " Encyclopedia " made no mention of class or registry at all , merely mentioning it as a " Federation starship " ( p . 363 ) . At the start of second season of the producers composed a fourteen ship list belonging to the , then still referred to as " " Starship " - class " by them , including " Valiant " . It should be noted that the inclusion of " Valiant " was a late addition and that it was not even considered in the first two proposals . This , canonically speaking at least , constituted somewhat of a conundrum , an observation not lost on Greg Jein , writer of the below - mentioned article , who noted that the ship in question was already destroyed in 2217 , whereas the Constitutions only became operational a decade later as far as was established by the production staff . ( " The Making of Star Trek " , p . 203 ; ) While another , new ship would have made more sense , the intent of the producers was clear , the class designation was retro - applied to the lost ship . All three lists were published in the " The Making of Star Trek " , pp . 164 - 165 . For his influential " The Case of Jonathan Doe Starship " article , published in the April 1973 issue 27 of the " T - Negative " fanzine , future " Star Trek " model maker Jein accepted the producer ' s intent and endowed " Valiant " with the appropriately lower conjectural registry number NCC - 1623 . But unlike many of his other conjectural " Constitution " - class registry numbers , the 2006 remastered version of the series afforded no opportunity to bring this ship to canon . The reference book " Star Fleet Technical Manual " also listed a " Constitution " - class starship with the name " Valiant " but assigned with the registry NCC - 1709 . Apocrypha . Both role - playing games from Last Unicorn and Decipher list the " Valiant " as a member of the , a design based on a rejected NCC - 1701 design by Matt Jefferies in the pre - production of the " Original Series " .