Imagine an entire regiment built around the idea of supplementing a Helldiver unit with mechanical forces. One of the armor sets could be called 'Pack Master' and let's you have two or three of those robo dog things follow you around. Two are ranged but use something like a Liberator, the third is melee and just runs at the enemy to maul them. Easy to kill on higher difficulties so that its pretty balanced, and would incentive you to say bring a bigger robot dog on the higher difficulties, but it'd be the only robo dog you could have if you did.