Some of my favorites, but most are only available for Kindle. A few in PDF by the publisher by the publisher directly or specialty shop (At least I didn't see them when I just looked.)
I'll tell you right off though, I'm more interested in personal memories and scholarly research than I am in touchy-feely retroactive rewritings of history for the purpose of selling books. So you'll see that theme.
Quartered Safe Out Here - George MacDonald Fraser (war in Far East/Burma)
An Army at Dawn: The War in North Africa, 1942-1943 - Rick Atkinson
Admiral Arleigh Burke - E.B. Potter (general pre-war navy and war in the Pacific mostly)
The Last Stand of the Tin Can Sailors: The Extraordinary World War II Story of the U.S. Navy's Finest Hour - James Hornfischer
Down to the Sea - Bruce Henderson
The Depths of Courage: American Submariners at War with Japan, 1941-1945 - Flint Whitlock and Ron Smith
The Bravest Man: Richard O'Kane and the Amazing Submarine Adventures of the USS Tang - William Tuohy
The Greatest Generation Speaks: Letters and Reflections - Tom Brokaw
Japanese Destroyer Captain: Pearl Harbor, Guadalcanal, Midway - The Great Naval Battles As Seen Through Japanese Eyes by Tameichi Hara, Fred Saito, and Roger Pineau
Goodbye Darkness: A Memoir of the Pacific War - William Manchester (audiobook only I think)
With Wings Like Eagles by Michael Korda
The Lady and the Tigers: Remembering the Flying Tigers of World War II by Olga Greenlaw and Daniel Ford
Panzer Leader by Heinz Guderian