ChromeHOUND

A massive AVC with interchangeable parts, so a single unit can preform multiple roles when changed. Can weight between 3000 tons and 6800 tons.
It will Kill you

Chromehounds was an xbox 360 game released in 2006. It revolved around chromehounds, giant mechanical walkers that had interchangable parts. There were 5...maybe 6 or 4 campaigns (give or take a few) in the game.
There were also RTs, basically downgraded HOUNDS and in certain campaign missions, there was also infantry NPCs , along with tank NPCs (They did almost no damage, but they were there)
In the campaign, You work for a mercenary company (I have forgotten its name) that is participating in the war
Oh yeah, the war. The games story takes place in 2006 after a war started over what I think were resources (Don't quote me on that)and the first mission is the tutorial, which is actually really fun (it allows complete free roam of the tutorial map) Most of the game takes place in what I think is europe (judging by the russian/french/british accents.
This game is almost completely forgotten, and the multiplayer servers are down, my personal wish is that a 2nd game, or a remaster would happen. But that is...unlikely