The tank of Maj. David Bardorf, the battalion executive officer for 1st Tank Battalion fires its main gun during the final exercise of the battalion’s combined arms exercise known as Steel Knight. The battalion trained in conjunction with multiple other units Dec. 6 through 12. - The tank of Maj. David Bardorf, the battalion executive officer for 1st Tank Battalion fires its main gun during the final exercise of the battalion’s combined arms exercise known as Steel Knight. The battalion trained in conjunction with multiple other units Dec. 6 through 12.