the commander rank is the highest rank you can Achieve in MTF, you are responsible for your Commissioned officers Actions, you are the one who leads the CO team and the regiment as a whole. 

long-serving Officers who were in most operations, raids, looking over Junior Officers.
And hard-working COs will receive the rank of major they are Confidential to become the next Commander 

once you served the MTF as CO for a period of time, You’ll be promoted to the rank of Captain, this rank take Responsibilities and ensure the Nu-7 SOP are being followed 

this is the entry rank to CO, it's designed for low priority & Responsibility as Commissioned officer
and joins the CoC