Excellent book that goes into detail about almost every aspect of the colonial marines featured in Aliens. Also, it's clear that the creators of the game "Aliens vrs. Predator" used this book, as certain weapons, symbols, and features (such as the smartgun and SADAR) are explained in detail, and correlate with the game. If you can't get enough of an "Aliens" fix from the game and the first two movies (let's just leave Aliens3&4 alone, shall we?), then this is the book for you! On occasion, the book gets a little bit gory, with none-too-subtle allusions made to the vietnam war. This gives the book a much more realistic feel, but may make some folks uncomfortable. The Aliens section is kinda neat; gives a little more insight into the "Weyland-Yutani" corporation, and once again demonstrates the poor judgement of this profit-seeking company. A very enjoyable read, especially to sci-fi "technophiles"!