The TAC party. Consists of the Battery FOO's the BC and all the associated ppl to make them hot brews and use radios for them.
The Regimental TAC is the COs Hard vehicle that deployes to Bde HQ.
The Brigade TAC is a small group of armoured vehicles that deploy forward of the Bde HQ when the Bde Commander wishes to see what's happening himself. Normally consists of the Bde Commander, the Arty Commander and the RE Commander with a close protection section.