Brigadier general

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Brigadier General is a senior commissioned officer of the UNSC Marine Corps and UNSC Army, equal in rank to Rear Admiral (Lower Half) in the UNSC Navy.

In informal settings, Brigadier Generals are typically referred to simply as "General".

A Brigadier General may be also referred to as a "one-star General" to distinguish it from the other ranks of General; so named for the one star rank insignia worn on the uniform.

Given that other officer ranks command the same unit groupings as their modern day U.S. counterparts do, it is highly probably that a Brigadier General commands brigade sized units. This has yet to be observed in the Halo universe though. A Brigadier General may also serve as a staff officer for higher commands.