As the flames of the Human/Naxli war are fanned into a blaze, the Second Combined Assault Brigade is thrown into the conflict.

But with troopers from throughout humanity, including former enemies, Gunnery Sergeant Reverent Pelletier struggles to mold his platoon into an effective fighting force, all while butting heads with his Mad Dog commander.

Under water, in the vacuum of space, and leading local forces, the platoon puts their stamp on history. But there is a limit to any fighting force. Will and discipline alone can't defeat overwhelming firepower. When faced with insurmountable odds, can Rev and his troopers survive, much less accomplish their mission?

Join Rev, Tomiko, Kelly, and the rest of the Marines and soldiers as they fight the Naxli aggression that threatens humankind's very existence.