Wait, warrior! No disrespect, but your squad looks a little light for this mission. Why don't you take one of my squad members? These are all seasoned, battle tested soldiers that you can trust with your life and your babysitter!
If you buy or steal all of the 2mm EC ammo off Maximus before the first battle, he will put his MEC Gauss minigun away and attack the robotsunarmed. You can then trade with him for his rare and powerful weapon, or loot it off of his corpse.