Sometimes I forget Battletech also has infantry? And apparently Clanner shock troops are also something that I only discovered so recently just because everyone else just talks about the Clan Omnimechs much more than anything else, really.
So uhh, genetically modified to be tall, shripped, fight and kill, but also fit snugly in their own suits of dedicated Battle Armour, wich in illustrations frequently resemble miniature mechs more than "power armour" as frequently portrayed in Sci-fi settings.