Chris is in a rough part of his life, being a 15 year old boy is hard enough as is, but add on the struggles of being the only human in a strange world and losing the small family you have and you're barely scratching the surface of his troubles.
A Company of the redeemed in the Northern Barrier Lands who use high risk tactics to protect civilian populations and make critical tactical maneuvers to sway the tide of war. Based on Upheaval universe, not cannon unless Visiden decides he likes it.