The armor-piercing ammunition pierces the exposed flesh while the glow of plasma rays dazzles your retinas. The acrid smoke penetrates your throat before you realize that it is you who is burning. Chemical weapons melt your armor, slowly cook your eyeballs, and fuse your helmet with your skull; biological weapons churn your insides and reduce you to a trembling pile of black jelly. Welcome to war on the outer limits of space, marine, where nuclear weapons are nothing new, pulse rifle bullets are cheap, and the only value of a human life is its weight in stock options. It's hell, although not as bad as the grinding of metal teeth that torments you every time you try to close your eyes, as if a monster were opening your head and getting into your dreams. Sometimes you wonder what the hell all this is for. But you're not paid to ask, but to follow orders. You're a nobody (no offense). So prepare your pulse rifle, marine, there's work to be done. Protect and serve the citizens of the Outer Rim colonies, no matter the cost. The Colonial Marines Operations Manual is a complete campaign module for the award-winning official ALIEN role-playing game that provides you with all the necessary tools to run an open campaign starring the iconic Colonial Marines.