In the US and British armed forces, a Naval Commander is equivalent in rank to an Army Lt. Colonel and a Naval Captain is equivalent in rank to an Army Colonel.
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Colonel is O6 in the USAF, USA, and USMC. In the Navy, 06 is Captain.
It would also be colonel. The Army, Air Force and Marine Corps all use the same officer ranks. The Navy is the odd service for ranking.
The equivalent is a Captain in the Navy.
The equivalent Navy rank is Commander.
General
A Group Captain is an RAF rank, equivalent to a naval Captain and an army Colonel.
Captain
No, there is no rank of commander in the Army. In the Army commander is a title, not a rank. In the Navy, there is a rank of Commander, it is the equivalent of Lt Colonel or O-5.
The rank following Colonel in the Marines, Army, and Air Force is Brigadier General.
This is filed under US ARmy and US Navy, so let me clarify.. A Captain in the Army is pay grade O3, whereas a Colonel in the Army is pay grade O6. Colonel is the higher of the two. The Navy has a different rank structure for officers than the other branches. A Captain in the Navy is 06 - equivalent to Colonel. The rank of Colonel does not exist in the Navy.
Commander is a rank exclusive to the Navy. It is the equivalent of an Army/Air Force/Marine Corps Lieutenant Colonel (O5). A Navy Captain is equivalent to an Army/Air Force/Marine Corps Colonel (O6), whereas a Captain in the Army, Air Force, or Marine Corps is O3. A Navy Captain outranks a Commander, but a Commander outranks an Army, Air Force, or Marine Corps Captain.
The spelling of the officer rank is "colonel" but the pronunciation (kernel) is derived from the equivalent rank coronel.
The rank that sounds like "kernel" is spelled colonel. The pronunciation was retained from the equivalent rank coronel.
All equivalent in rank/grade: Lt Col (O-5) in Army Lt Col (O-5) in Air Force Lt Col (O-5) in Marines Commander (O-5) in Navy
Major
Very basically speaking, the difference is one step in rank. While a Lt. Colonel is normally referred to a Colonel, a Colonel is sometimes to referred to as a "full bird colonel" to distinguish the difference. In the Army at least, a Lt. Colonel wears a clover leaf rank insignia (silver, I think) but a full Colonel wears an eagle insignia, hence the reference "full bird."
a colonel is a rank for the u.s army