Commander (disambiguation)
From Halopedia, the Halo wiki
Template:Rank Infobox Commander is a commissioned officer rank of the UNSC Navy, equal in rank to Lieutenant Colonel in the UNSC Marine Corps.
Commanders typically serve as the executive officer (XO) (second in command) of a UNSC Warship. However, they may also command a UNSC Warship.
Sources
In reference to the above image -- This is the U.S. Navy insignia for a Commander. The UNSC Navy uses the same insignia. -- Reference: It is visible on Commander Miranda Keyes' uniform during Halo 2 cinematics.