Setting aside all of the other plot holes and inconsistencies, the trying to be hip references that really end up sounding cringe worthy such as "YOLO", and "MLG", and "Selfie Stick", not to mention the fact that they have child soldiers flying helicopters, planning offensives, and generally depicted as competent as a highly trained marine in this book, the one thing I really want to know is this: 
 (view spoiler)[How in the fuck did Cassie manage to write a first person account of her death. Seriously, she mentions towards the beginning of the book that she's writing this as a journal of sorts even though she doesn't expect anyone to read it, blah, blah, blah. Yet her last FIRST PERSON chapter ends with her killing herself. (hide spoiler)] 
 Yeah that's probably the most annoying plot hole I've come across. All in all, this series was mediocre at best.