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 AFVs 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 Artillery Commander and the RE Commander with a close protection section.
If you came here looking for TAC as a building occasionally occupied by the TA, you need the link to TA Centre.