The fourth and final installment in Chris Lynch's Vietnam series, Casualties of War follows Beck, the smarty pants of the group of four friends this series revolves around. Due to the oath sworn by the four that if one of them goes to Vietnam they'll all go. Beck joins up with the Air Force, finding what joy he can in the war by maintaining the aircraft.
Casualties of War can't quite stand up by itself in the same way books two and three could've, and relies heavily on those two books for its plot, and while books two and three give good insight into the other three characters (Ivan, Morris, and Rudie) I felt like they sold Beck short. Even though this book is about Beck, it still feels more like a capstone on the Ivan/Rudie plot, leaving Beck out in the cold once again.
That's not to say Beck doesn't get to shine for a little while. We see how he has a different sort of battle to face, coming from a home of intellectuals who are extremely against the war, and don't understand why Beck would leave to join when he doesn't have to go.
Now, for the ending. The ending is explosive. Morris and Beck get pushed aside so that we can see the end result of Ivan and Rudie. The ending will be lost on anyone who hasn't read those two character's books, but for those who have, it ends in a (sadly) fitting way. I thought it was the perfect way to end the series, and am dying to see if other people caught the implications I saw in the last pages. (So drop me a line if you've finished it).
Anyway, I recommend the series as a good war series for younger readers. It shows the horrors of war without getting too graphic.