So, I opened Gran1pa's latest scenario,
Red: Killing Grounds, and proceeded to set Op Fire filters as is my custom. In particular setting for MBTs and ATGM units, but I filtered infantry too, although most infantry units were in urban area.
To my shock, none of my MBTs or ATGMs responded with a shot. Within a short order, the Russian armor horde had breached my line of defense.
Disenchanted, I opened Editor and built a quick test composed of a UK MBT platoon, supported by two SP-ATGM units and a squad of infantry ATGM. Battle date: 06/1984, UK vs Russia. Did not the Soviet Union disintegrate in 1991 into the several republics with a reconstituted Russia? If so, the game should display the Soviet flag for the year 1984.
After five turns the Russians breached the ATGMs unscathed. The Armor engagement setting was 20 hex for both MBTs and ATGMs.
In the subsequent case, I lifted all Op Fire filters and the result was startling.
I would have expected similar results with the Op Fire settings on especially considering the Russian side was assaulting.