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Second Lieutenant is a junior Commissioned officer rank of the UNSC Marine Corps, UNSC Army, and UNSC Air Force. It is the lowest commissioned officer rank, and is equal in rank to Ensign in the UNSC Navy. They are given command of platoons, such as the case of Second Lieutenant Oros in Halo: The Flood.
Second Lieutenant is an entry-level rank for most commissioned officers. A Second Lieutenant usually receives a promotion to First Lieutenant after eighteen to twenty-four months of active service.
In informal settings, Second Lieutenants are referred to simply as "Lieutenant".
| UNSC Defense Force commissioned officer ranks | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| O-1 | O-2 | O-3 | O-4 | O-5 | O-6 | O-7 | O-8 | O-9 | O-10 | Special (Wartime Only) | |
| Air Force: | 2nd Lt | 1st Lt | Capt | Maj | Lt Col | Col | Brig Gen | Maj Gen | Lt Gen | Gen | GOAF |
| Army: | 2LT | 1LT | CPT | MAJ | LTC | COL | BG | MG | LTG | GEN | GA |
| Marine Corps: | 2ndLt | 1stLt | CPT | Maj | LtCol | Col | BGen | MajGen | LtGen | Gen | |
| Navy: | ENS | LTJG | LT | LCDR | CDR | CAPT | RDML | RADM | VADM | ADM | FADM |
Second lieutenant is the lowest officer rank used by the MACOs and Federation Marines, superior to enlisted grades and subordinate to first lieutenant and captain (marines). A second lieutenant commands a platoon, about 30 troops.
This rank is also used in the Bajoran Militia and other armies. (DS9)
The rank is equivalent to the Starfleet rank of ensign, and lieutenant in the Federation Starfighter Corps.
The term comes from the armies and marines of Earth. The United States Army abbreviation was 2LT; the Marine Corps used 2ndLt.
| MACO | Klingon ground troops |
Bajoran Militia | Tal Shiar | Federation Marine Corps |
UESPA |
|---|---|---|---|---|---|
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| Enlisted personnel | Non-commissioned officers | Etc | Officers | Flag officers | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bajoran Militia | (unknown) | 2nd Lt | 1st Lt | Capt | Maj | FCol | Col | BGen | MajGen | LtGen | Gen | |||||||||||
| Klingon Defense Force |
Ground troops | Bekk | Cpl | Sgt | MSgt | SgtMaj | 2nd Lt | 1st Lt | Capt (HoH) |
Maj | LtCol | Col | Brig ('ech) |
LtGen | Gen (Sa') |
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| Navy | PO2 | PO1 | CPO | MCPO | ENS | LTJG | LT (Sogh) |
LCDR | CDR (la') |
CAPT (HoD) |
CDRE (totlh) |
VADM | ADM | |||||||||
| MACO | PV1 | PV2 | PFC | CPL | SGT | SSG | SFC | MSG | SGM | WO | 2LT | 1LT | CPT | MAJ | LTC | COL | BG | MG | LTG | GEN | MSHL | |
| Romulan ranks | Ground forces | Trooper | Sergeant | SubLt | Lt | Capt | Maj | Cent Col |
Gen | Major general |
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| Romulan Star Navy | Uhlan | Petty officer | Cent | SCdr | Cdr | Cgen | Adm (Ar'nal) | |||||||||||||||
| Tal Shiar | 2nd Lt | 1st Lt | Capt | Maj | Col | General | ||||||||||||||||
| Federation Marine Corps |
Pvt | PFC | LCpl | Cpl | Sgt | SSgt | GySgt | MSgt 1st Sgt |
MGySgt SgtMaj SMOMC |
WO | 2nd Lt | 1st Lt | Capt | Maj | LtCol | Col | BGen | MajGen | LtGen | Gen | GenCorps | |
| UESPA | REC | PVT | PFC | CPL | SGT | SSG | SFC | MSG | SGM | 2LT | 1LT | CPT | MAJ | LTC | COL | BG | MG | LTG | GEN | MSHL | ||
Second Lieutenant was a lesser grade of lieutenant, below First Lieutenant. It was used in the military forces of various Galactic governments, including the Galactic Empire and the Rebel Alliance.
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