Lieutenant colonel

N.B.: This rank has not yet been mentioned in the Halo Universe.

Lieutenant Colonel is a commissioned officer rank of the UNSC Marine Corps, equal in rank to Commander in the UNSC Navy.

A Lieutenant Colonel typically commands a Battalion-sized unit (300 to 1,000 soldiers), with a Sergeant Major as senior non-commissioned officer. A Lieutenant Colonel may also serve as a Brigade or task force Executive Officer (second in command).

In informal settings, Lieutenant Colonels are referred to simply as "Colonel".