[2] Brennan serves all areas west of Loop 1604 from just south of the Alamo Ranch neighborhoods west to the Medina County–Bexar County line near Texas State Highway 211 (Hill Country Parkway), extending south to near Marbach Road and its intersection at Grosenbacher Road.

The far west areas of San Antonio, Texas, are experiencing rapid growth[3] and Brennan alleviated overcrowded conditions at neighboring William Howard Taft High School and John Paul Stevens High School.

The Brennan Bear Band is under the direction of Thomas Kober with assistant directors Mark Wolocki and Tim Briones.

At the USBands New Braunfel Showcase, Brennan received first place for the categories of "Percussion, Visual, and Music".

The band received a first division in the UIL Region marching competition, advancing them to Area Prelims at Dub Faris Stadium in San Antonio.