2 for anything by Wouk. These mentioned but also The Caine Mutiny. Both the book and movie are outstanding.
Best fiction book ever is "Once an Eagle."
Although based on the Army, the concepts you see b1tched about so much here as new afflictions are vividly illustrated in the book. This book follows a regular guy from his enlistment in the 1917 Pancho Villa expedition, through WWI, the Great Depression, WWII, and into early Vietnam.
Just great writing and anyone with a familiarity with the military will recognized the characters and problems.
A huge part of what made me want to join, then cope, then eventually leave, the service.
Best book ever.