I personally like the first one the best though Leatherneck looks kind of lonely without a weapon in his hands. Overall though I wonder if the chassis you want to use to mount your weaponary is too big cause it looks huge compared to the aresenal its packing. Also if that gun is a 105mm shouldn't it be bigger? I like the idea of a an artillery piece but I think Ion brings up a good point in the conception of the Ocktober Guards military capability. These aren't really the guys you would expect to be giving you artillery support or anti aircraft support, really these guys are a behind the enemy lines type or a fast assault group. At least thats the idea I get from the GI JOE comics but hey you know the Russians they like their armoured vehicles and they like them in spades. But otherwise the vehicles look fine just being the artillery lover that I am I'd want more firepower. Though the Equalizer chassis I would think is versatile for a number of uses and it looks good how you're using it, I think I'd just want some bigger guns
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Keep up the great work though.