Behind the TOC is another bunker. You can see the entrance at the right of this picture. This was where the BN commander, the S3 and the XO (when he was at C2) slept. Article 15 paperwork, discharges and promotions, awards and letters to next of kin all went through this bunker office.
Behind the bunker is a firing position for the 5/4 artillery and a tower used by the "Flash and Bang" platoon as they attempted to spot rocket firing positions. These troops were from somewhere else and almost orphans but CSM "Q" got that worked out and they began to eat 1/61 chow. But that is another story