Instruct: Classify a given review into positive or negative sentiment.
Query: Great in the beginning slow at the end

It was a good book until the Vietnam War. Then he no longer talked about the United States SEALs, but some Vietnam SEALs he was training. The book would have been a good book if he had stuck with the United States SEALs. There are better books about the SEALs. I myself happen to like COMBAT SWIMMER by Captain Robert A. Gormly much better than this one!!