Their primary function of Lieutenant Colonels is to serve as commanders of battalion-sized elements. Although, they can also serve as staff officers at the brigade level or above, aiding in the planning, resourcing, and functioning of units.
Lieutenant Colonels serving as commanders of battalions are the final authority on everything that occurs in the battalion, recognized as responsible for everything the battalion does or fails to do.
1) (12) months TIG as O-4 Major
2) Personally promoted by the Commanding Officer of the Regiment