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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 United States Navy), it is placed between ensign and full lieutenant. The rank is used primarily by the Federation Starfleet, although its United 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.

Rank insignia of Starfleet lieutenants junior gradeEdit

Command-Service Operations-Service Sciences-Service
2280s 2285 Command Lieutenant JG 2285 Medical Lieutenant JG
2350s 2350 - LTJG (Command)-1-
2360s 2366 S-Command Lieutenant JG
2370s 2373 Command Lieutenant JG 2373 Engineering Lieutenant JG 2373 Medical Lieutenant JG

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