From the introduction:
The world of Aliens vs. Predator promotes a cold, cruel future where corporations guide human destiny and alien races clash with humanity caught in the middle. There are a number of resources to help define the world of AVP including the Aliens and Predator movies, novels, and comics as well as websites dedicated to this deep world.
This book is not intended to reproduce those works, but rather to provide the rules and guides necessary to play a game of Simple 10 within that universe. As a result, a lot of information will be missing from this book that must be gathered elsewhere.