Lieutenant Colonel

Lieutenant Colonel was a military rank, derived from and subordinate to Colonel, used by ground forces (armies) and some starfighter operations. It was one rank higher than a Major.

Galactic Empire
A Lieutenant Colonel in the Imperial Army was one rank below Colonel and one rank above Major, and was commander of an Imperial regiment.

Unlike Colonel, a Lieutenant Colonel primarily served in the field, though they sometimes served as a staff officer advisor or adjutant to a higher ranking officer. A Lieutenant Colonel was equivalent to a Commander in the Imperial Navy.

New Republic
A Lieutenant Colonel in the New Republic Army was often the chief supporting officer to the Colonel, serving as a bridge between the base and the field. In the New Republic Marine Corps, a Lieutenant Colonel was assigned to a starship and put in charge of an entire vessel's Marine contingent or their own battalion. Other roles included being a direct aide to the flagship General, or perforing the roles of a Major. Support officers of this rank were typically assigned on a brigade level, capable of commanding an entire starship's detachment of support personnel. Lieutenant Colonels were the highest ranked field combat commanders.

In the New Republic Starfighter Corps, these men were assigned to a starship and put in charge of an entire vessel's Strike Force, or in charge of their own squadron. They could serve as direct aides to the flagship General, or perform the roles of a Major. Support officers of this rank were typically assigned on a Strike Group level, capable of commanding an entire starship's detachment of support personnel.