Waddo
Smudge,
I too was at Waddo at the time of that incident and was in the COC. The intruders had also forced their way into the outer part of the COC and had smashed the foresight of a weapon onto the hand of one of the SNCOs who tried to stop them causing serious injury. IRC it was Ex Brave Defender. I also seem to remember that the intruders chainsawed the oak door to SHQ which had some history.
The exercise was indeed terminated and a number of VSOs then arrived in various helicopters and a formal apology for the conduct of the TA SF was later broadcast I think.