If I remember in this format 2/10, first number (2) is the Div number, and the second number (10) is the ID number for the regiment within that Div. I have no Idea what the regiments role was, I'm assuming as it is a fairly small number, they were an armoured regiment and the Scorpion was in their recce troop.We, 15/19 H were in BAOR 1979-86, ours was 3/45, as we were 3rd Div Armoured Recce Regiment.