|Affiliation:||Starfleet Marine Corps|
|Higher Rank:||First Lieutenant|
|Command:|| *Platoon (Marine)
|Known Second Lieutenant||Second Lieutenants|
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Second Lieutenant is the lowest line officer rank. It is an entry level rank for those that have completed the Starfleet Marine Academy, this rank is above the Non-Commissioned Officers and Enlisted Ranks, however it is below First Lieutenant and has a ranking code of O-1. The rank is equivalent to Ensign in the Starfleet. The rank insignia consists of one gold color.