Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: The biographies of William Wylie Galt and Luther Sidney Gustafson

Erik Gustafson has written a masterpiece regarding the lives of his two uncles who were killed in action in WWII. Sid was killed in Northern Africa, and remains buried there. Bill was killed in Italy, and received the Medal of Honor for his valor. Sid was awarded the Distinguished Service Cross. Erik has brought their short, brave lives to life in this narrative that includes their letters they sent home to their relatives. The two were SAE fraternity brothers at Montana State College, and the closest of friends. After graduation, the two were commissioned, trained, and sent overseas to never come home. They live on forever in Erik's book,