Lieutenant junior grade

Lieutenant JG insignia
File:Tos ltjg.png
Starfleet, 2260s
File:Mov ltjg.png
Starfleet, 2280s until early 24th century
File:Tng ltjg.png
Starfleet, 2350s-present
File:Vgr ltjg.png
Starfleet 24th century provisional lt. j.g.

Lieutenant junior grade (often abbreviated to lieutenant J.G. or simply J.G.), or junior lieutenant is a military rank, the equivalent of which is used by the service organizations of many civilizations. A naval rank in a small number of Earth's ancient navies (such as the US Navy), it is placed between ensign and full lieutenant. The rank is used primarily by the Federation Starfleet, although its Earth predecessor (from which it primarily takes its rank structure) may also have had this grade.

During certain points in its history, Starfleet has discontinued the rank of Lieutenant Junior Grade, promoting Ensigns directly to the full grade of Lieutenant. This was the case in the early 2270s, when Ensigns adopted the sleeve insignia of the former Lieutenant J.G. rank, the J.G. rank being done away with. Historical records also indicate that the Earth Starfleet did not use the rank during the 2150s.

An issue of Star Trek: The Magazine established that the costuming department on Star Trek: Enterprise had no insignia for lieutenant junior grade, although this does not necessarily mean the rank did not exist. Several pre-production publications regarding Star Trek: The Motion Picture established that the Lieutenant J.G. rank also did not exist during the time frame of the film.

It is unclear if the grade exists in other cultures' rank arrangements, although it may correspond to the Romulan rank of sublieutenant.

List of Starfleet lieutenants JG

Starfleet lieutenants

• Joe Tormolen (TOS: "The Naked Time")
• Saavik (Star Trek II: The Wrath of Khan)
• Foster (Star Trek III: The Search for Spock)
• Janice Rand (Star Trek VI: The Undiscovered Country)
• Richard Castillo (TNG: "Yesterday's Enterprise")
• Jack Crusher (TNG: "Journey's End")
• Geordi La Forge (TNG Season 1)
• Worf (TNG Season 1)
• Singh (TNG: "Lonely Among Us")
• Orfil Solis (TNG: "The Arsenal of Freedom")
• Reginald Barclay (TNG: "Hollow Pursuits")
• Duffy (TNG: "Hollow Pursuits")
• Eiger (Star Trek: First Contact)
• Temple (TNG: "Transfigurations")
• Linda Larson (TNG: "The Nth Degree")
• Jenna D'Sora (TNG: "In Theory")
• Van Mayter (TNG: "In Theory")
• Monroe (TNG: "Disaster")
• Aquiel Uhnari (TNG: "Aquiel")
• Julian Bashir (DS9: "Emissary")
• Palmer (TNG: "Second Chances")
• Sam Lavelle (TNG: "Lower Decks")
• Alyssa Ogawa (TNG: "Lower Decks")
• Daniel Kwan (TNG: "Eye of the Beholder")
• Nara (TNG: "Eye of the Beholder")
• Tom Paris (Star Trek: Voyager)
• Elizabeth Lense (DS9: "Explorers")
• Chandler (DS9: "Inquisition")
• Kagan (DS9: "Inquisition")
• Laura Derr (DS9: "In the Pale Moonlight")
• Faith Levesconte (DS9: "In the Pale Moonlight")
• Ezri Dax (DS9 Season 7)
• Hector Ilario (DS9: "Field of Fire")
• Nog (DS9: "What You Leave Behind")
• Wesley Crusher (Star Trek Nemesis)

Provisional

• Ayala (Star Trek: Voyager)
• B'Elanna Torres (Star Trek: Voyager)

Alternate Reality

• Jean-Luc Picard (TNG: "Tapestry")

Background

Only one officer in TOS wore a Lt. JG insignia, Tormolen in "The Naked Time", even though some officers (Charlene Masters, Marla McGivers) were referred to as "lieutenant" but wore no insignia at all, like ensigns. This particular rank is portrayed in every Starfleet rank scheme, but rarely mentioned in dialogue.

This chart shows only general equivalencies based on the ranks used by many governments on Earth, as well as the rest of the galaxy.