I had an uneven response to this. I think McKenna is one of the best military writers I've come across. Her knowledge of the details, speech patterns, attitudes of US soldiers struck me as spot on, and infinitely better than the average writer. I really like the story's premise and the way that the book focused on integrating werewolves into combat operations in real-world "theaters of war."
That being said, this is a long book, and yet I felt like there were some key aspects missing. We are never given any specifics or history about werewolves' open role in this society or in the military and since I was very curious about it, I ended up feeling severely frustrated, especially since what we do get tends to be reiterations of the same basic situations over and over again.
Bottom line: I admired the writing here tremendously, so much that I'd even posit that McKenna should be required reading for anyone thinking about writing about the US military. Beyond that, I had a lot of frustrations with what the story included and what it left out.