In the United States Marine Corps and the United States Brigadier Beneral is a one-star general officer, with the pay grade of O-7. Brigadier General ranks above
Colonel and below
Major General. Brigadier General is equivalent to a rear admiral (lower half) in the other uniformed services.
Today, an Army or Marine Corps "BG" typically serves as Deputy Commander to the Commanding General of a division or division-sized units and assists in overseeing the planning and coordination of a mission. In an infantry brigade not attached to a division, a Brigadier General serves as the unit's commander, while a Colonel serves as deputy commander. An Air Force brigadier general typically commands a large wing. Additionally, one-star generals of all services may serve as high-level staff officers in large military organizations.