I was with 21 Svc Bn in '76 into '77 with Transport. I went there from the Sea Cadets in Hunter with my buddy and had a blast. Ended up joining the Reg Force in '77 and served 19 years before retiring in '96 as a 935 Sgt.
I would have instructed some members on their CLC (no JLC taught in those days) at the LMD Battleschool in Ipperwash in the late 80's early 90's.
Probably some on their recruit course at the same time period & place.