All of them boast powerful weapons from xingwang's blog

Accompanying the visual improvements is a complete redesign of in-game sound effects. Each shot effect is now created from several layers of War Thunder Golden Eagles  sounds that correspond to peak and residual effects. Thus, experienced tankers are now able to determine the caliber of the cannon that fired the shot, even from distance. The effects themselves received additional details, so players can now hear the sound of cases dropping as they fire, or the working loading mechanisms of their cannons. Aircraft sounds are more vibrant and powerful. Further improvements are also planned for future updates.

Several next generation main battle tanks of the 1970s and 1980s now reinforce the arsenal of War Thunder on Rank VI: the U.S. M1 Abrams, British Challenger 1, German Leopard 2K, Soviet T-64B and French AMX-30B2 Brenus. All of them boast powerful weapons, armor, high speed, and mobility. Noteworthy here is the special cannon of the T-64B that allows it to fire ‘Cobra’ guided anti-tank missiles and the AMX-30B2 Brenus’ powerful reactive armor. Some of the vehicles introduced with Update 1.77 are still in service today.