The USS Fall Den (NCC-2790) was a Loknar-class (mark IV subclass) Federation frigate starship in the late 23rd century, entering Starfleet service on reference stardate 2/1810. (FASA RPG module: Federation Ship Recognition Manual)

Loknar-class class VIII-class X frigate starships
Mark I	Ahkeil • Aldebaran • Alondra • Antares • Antos IV • Arcannis • Argelia • Argus City • Aurelia • Berlin • Borga • Boridi • Carinae II • Carinae V • Chicago • Corinth IV • Daran V • Deneb Clar • Ekos • Elas • Epcot • Farside • Gaikos • Halk • Ilyra • Kosk • Loknar • Los Angeles • Makusia • Mjorn • Mordensia • Morgan City • Moscow • New America • New York • Opkapi • Paris • Peking • Proxima • Rome • Sydney • Tokyo • Trantis • Troyius • Vernol • Yonada
Mark II	Alpha Colony • Altair VI • Capor Bana • Dallas • Deneva Ra • Helios • Houston • Irilia • Izar • Karrik Al Van • Lactra • Lavinius • London • Ptarth • Rhea • Rio de Janeiro • Thefel • Titan	Mark III	Ariannus
Mark IV	Bondorant • Cairo • Coridan • Cygni Minor • Drox • Fall Den • Garros • Iotia • Janus Colony • Johannesburg • Luna • Mantilles • Molens • New Delphi • Noma Ra Den • Phobos • Que Dane • Salos • Sogon • Stockholm • Thuphylla • Toronto • Trifis • Tryla • Vladivostok
Mark V	Arkadelphia • Caitos Prea • Hobbiton • Hong Kong • Jezar • Kism • Mulandra • Tog	other ships	Akhiel
captured by Klingons	Staav'eMara