I just finished up "Scorpion Down", which was a fantastic book on the loss of the nuclear submarine Scorpion in 1968...Good read and pretty insightful regarding the rise of the Russian Navy and there's even a little conspiracy theory in there.
Right now, I'm reading a book on submarine warfare called "Blind Mans's Bluff". It's a compilation of several submarine stories from the cold war. It's pretty entertaining due to the clandestine nature of submarines and their role durring the Cold War.
"Three Engines, Half a Wing, and a Prayer" is also a great book. It's about B-17's in Europe, and it chronicles what crewmembers went through in combat. It covers several of the more famous raids in WWII and the losses associated with them. I really enjoyed this one and it really put into context what the "Greatest Generation" went through, and made me want to keep their sacrifices on the fore front of my memory.