War Story, Derek Robinson.
First in the author's RFC Quartet. We accompany a brash but inexperienced new pilot as he joins a fictional RFC squadron where he quickly makes himself unpopular and finds his experiences of a combat to be very different from his expectations. Life expectancy for a pilot is short, and characters disappear quite suddenly. The way in which the survivors deal with this stress is the main thrust of the book, and the contrast between the vigorous parties and the vicious fighting is at the heart of this excellent novel.
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