Mate I was stationed in Germany for 6 yrs, and was trained in that environment, yes I know it was the desert ta, 14 Brit Chally2's is around 1 Sqn worth with different main armament size to the M1 Abrahams,

Supply of spares was and always will be a sticking point.

Crews with little or no experience won't stand a chance.

And yes you are correct, top down attacks are where the vehicles are most vulnerable, as it's the least armoured area of all of them.

As always the Russian T72's even the T90 is fairly basic compared to our vehicles it just there's so many of them!

21 mins in a hot war with the Soviets back in the day, and we knew what we were doing as we trained many times a year, and every few years pretty much the entire lot was mobilised including the Americans.