Great books, Apache
A few books I've enjoyed:
WW2 naval
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Run Silent, Run Deep - Edward L Beach - USN submarine war against Japan
The Ship - C.S. Forester - a RN light cruiser escorting a convoy to Malta against sea and air attacks
The Good Shepherd - C.S. Forester - USN destroyer in Battle of the North Atlantic
Das Boot - Lothar-Günther Buchheim - Battle of the North Atlantic from the perspective of a U-Boat crew
Away All Boats - Kenneth Dodson - a USN attack transport in the South Pacific campaigns
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WW1 naval
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The Blooding of the Guns - Alexander Fullerton - Battle of Jutland from the perspective of 3 RN officers of same family - captain of a dreadnought, junior officers on a battle cruiser and a M class destroyer
A Sailor of Austria - John Biggins - Austrian U Boat in the Med
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WW1 air war
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Goshawk Squadron - Derek Robinson - Royal Flying Corps squadron on the Western Front
Flight To Mons - Alexander Fullerton - using a Fleet Air Arm dirigible to insert and extract spies from German-occupied Belgium
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WW2 air war
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Piece of Cake - Derek Robinson - RAF fighter squadron in Battle of France and Battle of Britain
Dauntless - Barrett Tillman - dive bomber squadron from Yorktown at Battle of Midway
War and Remembrance - Herman Wouk - a USN family in WW2 - Only some bits about combat, but there is a great description of the Battle of Midway and the courage and sacrifice of the USN torpedo bomber squadrons
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WW1 ground war
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All Quiet On the Western Front - Erich Maria Remarque - the Western Front from the point of view of a German infantryman
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WW2 ground war
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The Thin Red Line - James Jones - Guadalcanal ground combat - Jones actually fought at Guadalcanal (he was a private in the 25th "Tropic Lightning" Division at Pearl Harbor)