"Helmut for My Pillow" by Robert Leckie ; a book about the Pacific island battles during WW II.
Great book! It was one of the World War II memoirs used to make the HBO mini-series "The Pacific."
BTW...Have you read Eugene Sledge's, With the Old Breed about his days as a Marine at the battles of Peleliu and Okinawa during World War II? Its outstanding.