Put On Your War Paint (A COD: AW Fanfiction)

Trevor Donahue has lived a hard life. His mother died when he was 9, and he grew up not knowing who his father was. He trained most of his life in hopes of joining the Marines - a dream that came true. After his team is killed, he leaves to join Atlas. He enjoys his time there - until a secret is discovered that may change the fate of the world. He tries with everything to prevent it, even switching sides and being drafted into Sentinel. There will be many trials along the way, and challenges to face. He'll learn to overcome things he never thought possible. But the big question is... Will he end this war? (Also it's rated M because violence and curses obviously)