What is the rank designation for a Colonel in the Army?

In the U.S. Army, the rank designation for a Colonel is O-6. This classification falls within the officer rank structure, where "O" indicates an officer rank, and the number corresponds to the level of responsibility and hierarchy. Colonels serve crucial roles, often commanding brigades or serving in senior staff positions.

While other ranks such as O-5, O-7, and O-8 represent other officer levels, they denote different ranks. For instance, O-5 corresponds to the rank of Lieutenant Colonel, which is one level below Colonel, while O-7 and O-8 refer to Brigadier General and Major General, respectively, indicating higher ranks. Understanding these distinctions is essential for grasping the military hierarchy and the responsibilities associated with each rank.