Valdor: Birth of the Imperium pg. 168

Valdor knew what he meant. They were raw, these first ones- still bleeding from the last of their implants, their muscles chafing against the initial marks of power armour. Their minds were bruised and infantile, ravaged by imperfect psycho-conditioning, and their weapons had only been recently been machine-spirit-locked to the counterpart systems in their tactical helms. There was so much that was rushed about them, so many points of potential failure, and yet they were going to win this, because, acting together, they were already terrifying.