Were they classified? I have a memory that the 80s versions at least were marked 'Restricted'
Yes, they were marked 'RESTRICTED' which meant that every ATC Squadron across the Empire had them!
They did become, erm, a bit 'spotterish'. Each copy did seem to contain a Recognition Test consisting of images of front drive sprockets of WARPAC armoured fighting vehicles. I suggest if you were that close to the Soviets, identifying whether it was a Command variant was likely to be rather academic.