Sgt. Coutrney R. Lawrence, Houston-native who served the role of drum major for the Marine Drum & Bugle Corps, leads in front of the D&B as it marches onto the field at the start of a Tuesday Sunset Parade at the Marine Corps War Memorial in Arlington, Va., July 24. Sgt. Maj. Micheal P. Barrett, sergeant major of the Marine Corps, served as the hosting official for this parade, which featured noncommissioned officers in positions traditionally held by officers and staff noncommissioned officers. The drum major, a position traditionally held by a gunnery sergeant or higher, is the senior-billeted Marine in the D&B and leads the musical unit in its ceremonies by both directing the Marines as they march and conducting them as they play. - Sgt. Coutrney R. Lawrence, Houston-native who served the role of drum major for the Marine Drum & Bugle Corps, leads in front of the D&B as it marches onto the field at the start of a Tuesday Sunset Parade at the Marine Corps War Memorial in Arlington, Va., July 24. Sgt. Maj. Micheal P. Barrett, sergeant major of the Marine Corps, served as the hosting official for this parade, which featured noncommissioned officers in positions traditionally held by officers and staff noncommissioned officers. The drum major, a position traditionally held by a gunnery sergeant or higher, is the senior-billeted Marine in the D&B and leads the musical unit in its ceremonies by both directing the Marines as they march and conducting them as they play.