From Halopedia, the Halo wiki
Commanders form the primary leadership of all Promethean Knight detachment. Their rank is not so much based on rate or experience, but strategic necessity. They are outfitted with impressively heavy armor. Commanders deploy floating Autosentry turrets, use enhanced vision and usually wield incineration cannons which makes them formidable against large numbers of infantry, powerful weapon emplacements, and heavy vehicles.
They are especially deadly in close range as they emit a deadly pulse which launches them in the air and pushes off enemies. This ability takes a small amount of time to charge.
The Commanders have distinct light patterns, which indicate command, on their carapace and heads. They have rippling light from energy expenditure surrounding them. Their silhouette remains otherwise the same as regular Knights.
List of appearances